diff --git a/README.MD b/README.MD
index a525f02..412596e 100644
--- a/README.MD
+++ b/README.MD
@@ -35,25 +35,27 @@ flowchart LR
     Client["🖥️ 客户端 / SDK\n(OpenAI / Claude / Gemini)"]
     Upstream["☁️ DeepSeek API"]
 
-    subgraph DS2API["DS2API 3.x（统一 OpenAI 内核）"]
+    subgraph DS2API["DS2API 4.x（模块化 HTTP surface + PromptCompat 内核）"]
         Router["chi Router + 中间件\n(RequestID / RealIP / Logger / Recoverer / CORS)"]
 
-        subgraph Adapters["协议适配层"]
-            OA["OpenAI\n/v1/*"]
+        subgraph HTTP["HTTP API surface"]
+            OA["OpenAI\nchat / responses / files / embeddings"]
             CA["Claude\n/anthropic/* + /v1/messages"]
             GA["Gemini\n/v1beta/models/* + /v1/models/*"]
-            Admin["Admin API\n/admin/*"]
+            Admin["Admin API\n资源子包"]
             WebUI["WebUI\n/admin（静态托管）"]
+            Vercel["Vercel Node Stream\n/v1/chat/completions"]
         end
 
         subgraph Runtime["运行时核心能力"]
-            Bridge["CLIProxy 转换桥\n(多协议 <-> OpenAI)"]
-            OAEngine["OpenAI ChatCompletions\n(统一工具调用与流式语义)"]
+            Compat["PromptCompat\n(API -> 网页纯文本上下文)"]
+            Chat["Chat / Responses Runtime\n(统一工具调用与流式语义)"]
             Auth["Auth Resolver\n(API key / bearer / x-goog-api-key)"]
             Pool["Account Pool + Queue\n(并发槽位 + 等待队列)"]
-            DSClient["DeepSeek Client\n(Session / Auth / HTTP)"]
-            Pow["PoW 实现\n(纯 Go 毫秒级)"]
+            DSClient["DeepSeek Client\n(Session / Auth / Completion / Files)"]
+            Pow["PoW 实现\n(纯 Go)"]
             Tool["Tool Sieve\n(Go/Node 语义对齐)"]
+            History["History Split\n(长历史文件化)"]
         end
     end
 
@@ -61,19 +63,23 @@ flowchart LR
     Router --> OA & CA & GA
     Router --> Admin
     Router --> WebUI
+    Router --> Vercel
 
-    OA --> OAEngine
-    CA & GA --> Bridge
-    Bridge --> OAEngine
-    OAEngine --> Auth
-    OAEngine -.账号轮询.-> Pool
-    OAEngine -.工具调用解析.-> Tool
-    OAEngine -.PoW 计算.-> Pow
+    OA --> Compat
+    CA & GA --> Compat
+    Compat --> Chat
+    Compat -.长历史.-> History
+    Vercel -.Go prepare.-> Chat
+    Vercel -.Node SSE.-> Tool
+    Chat --> Auth
+    Chat -.账号轮询.-> Pool
+    Chat -.工具调用解析.-> Tool
+    Chat -.PoW 计算.-> Pow
     Auth --> DSClient
     DSClient --> Upstream
     Upstream --> DSClient
-    OAEngine --> Bridge
-    Bridge --> Client
+    Chat --> Client
+    Vercel --> Client
 ```
 
 详细架构拆分与目录职责见 [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)。
diff --git a/README.en.md b/README.en.md
index 299d228..747993d 100644
--- a/README.en.md
+++ b/README.en.md
@@ -33,25 +33,27 @@ flowchart LR
     Client["🖥️ Clients / SDKs\n(OpenAI / Claude / Gemini)"]
     Upstream["☁️ DeepSeek API"]
 
-    subgraph DS2API["DS2API 3.x (Unified OpenAI Core)"]
+    subgraph DS2API["DS2API 4.x (Modular HTTP Surface + PromptCompat Core)"]
         Router["chi Router + Middleware\n(RequestID / RealIP / Logger / Recoverer / CORS)"]
 
-        subgraph Adapters["Protocol Adapters"]
-            OA["OpenAI\n/v1/*"]
+        subgraph HTTP["HTTP API Surface"]
+            OA["OpenAI\nchat / responses / files / embeddings"]
             CA["Claude\n/anthropic/* + /v1/messages"]
             GA["Gemini\n/v1beta/models/* + /v1/models/*"]
-            Admin["Admin API\n/admin/*"]
+            Admin["Admin API\nresource packages"]
             WebUI["WebUI\n/admin (static hosting)"]
+            Vercel["Vercel Node Stream\n/v1/chat/completions"]
         end
 
         subgraph Runtime["Runtime + Core Capabilities"]
-            Bridge["CLIProxy Bridge\n(multi-protocol <-> OpenAI)"]
-            OAEngine["OpenAI ChatCompletions\n(unified tools + stream semantics)"]
+            Compat["PromptCompat\n(API -> web-chat plain text context)"]
+            Chat["Chat / Responses Runtime\n(unified tools + stream semantics)"]
             Auth["Auth Resolver\n(API key / bearer / x-goog-api-key)"]
             Pool["Account Pool + Queue\n(in-flight slots + wait queue)"]
-            DSClient["DeepSeek Client\n(session / auth / HTTP)"]
-            Pow["PoW Solver\n(Pure Go ms-level)"]
+            DSClient["DeepSeek Client\n(session / auth / completion / files)"]
+            Pow["PoW Solver\n(Pure Go)"]
             Tool["Tool Sieve\n(Go/Node semantic parity)"]
+            History["History Split\n(long history as files)"]
         end
     end
 
@@ -59,19 +61,23 @@ flowchart LR
     Router --> OA & CA & GA
     Router --> Admin
     Router --> WebUI
+    Router --> Vercel
 
-    OA --> OAEngine
-    CA & GA --> Bridge
-    Bridge --> OAEngine
-    OAEngine --> Auth
-    OAEngine -.account rotation.-> Pool
-    OAEngine -.tool-call parsing.-> Tool
-    OAEngine -.PoW solving.-> Pow
+    OA --> Compat
+    CA & GA --> Compat
+    Compat --> Chat
+    Compat -.long history.-> History
+    Vercel -.Go prepare.-> Chat
+    Vercel -.Node SSE.-> Tool
+    Chat --> Auth
+    Chat -.account rotation.-> Pool
+    Chat -.tool-call parsing.-> Tool
+    Chat -.PoW solving.-> Pow
     Auth --> DSClient
     DSClient --> Upstream
     Upstream --> DSClient
-    OAEngine --> Bridge
-    Bridge --> Client
+    Chat --> Client
+    Vercel --> Client
 ```
 
 For the full module-by-module architecture and directory responsibilities, see [docs/ARCHITECTURE.en.md](docs/ARCHITECTURE.en.md).
diff --git a/docs/ARCHITECTURE.en.md b/docs/ARCHITECTURE.en.md
index ed23416..1f6b24a 100644
--- a/docs/ARCHITECTURE.en.md
+++ b/docs/ARCHITECTURE.en.md
@@ -102,33 +102,79 @@ ds2api/
 
 ```mermaid
 flowchart LR
-    C[Client/SDK] --> R[internal/server/router.go]
-    R --> OA[OpenAI HTTP API]
-    R --> CA[Claude HTTP API]
-    R --> GA[Gemini HTTP API]
-    R --> AD[Admin HTTP API]
+    C[Client / SDK] --> R[internal/server/router.go]
 
-    CA --> BR[translatorcliproxy]
-    GA --> BR
-    BR --> CORE[internal/httpapi/openai/chat ChatCompletions]
-    OA --> CORE
+    subgraph HTTP[HTTP API surface]
+        OA[internal/httpapi/openai]
+        CHAT[openai/chat]
+        RESP[openai/responses]
+        FILES[openai/files + embeddings]
+        CA[internal/httpapi/claude]
+        GA[internal/httpapi/gemini]
+        AD[internal/httpapi/admin/*]
+        WEB[internal/webui static admin]
+    end
 
-    CORE --> AUTH[internal/auth + config key/account resolver]
-    CORE --> POOL[internal/account queue + concurrency]
-    CORE --> TOOL[internal/toolcall parser + internal/toolstream sieve]
-    CORE --> DS[internal/deepseek/client]
+    subgraph COMPAT[Prompt compatibility core]
+        PC[internal/promptcompat]
+        PROMPT[internal/prompt]
+        HIST[internal/httpapi/openai/history]
+    end
+
+    subgraph RUNTIME[Shared runtime]
+        AUTH[internal/auth]
+        POOL[internal/account queue + concurrency]
+        STREAM[internal/stream + internal/sse]
+        TOOL[internal/toolcall + internal/toolstream]
+        DS[internal/deepseek/client]
+        POW[pow + internal/deepseek/protocol]
+    end
+
+    subgraph NODE[Vercel Node Runtime]
+        NCS[api/chat-stream.js]
+        JS[internal/js/chat-stream + stream-tool-sieve]
+    end
+
+    R --> OA --> CHAT
+    OA --> RESP
+    OA --> FILES
+    R --> CA
+    R --> GA
+    R --> AD
+    R --> WEB
+    R -.Vercel stream.-> NCS
+
+    CA --> PC
+    GA --> PC
+    CHAT --> PC
+    RESP --> PC
+    PC --> PROMPT
+    PC -.long history.-> HIST
+    PC --> AUTH
+
+    NCS -.Go prepare/release.-> CHAT
+    NCS --> JS
+    JS --> TOOL
+
+    AUTH --> POOL
+    CHAT --> STREAM
+    RESP --> STREAM
+    STREAM --> TOOL
+    POOL --> DS
+    DS --> POW
     DS --> U[DeepSeek upstream]
 ```
 
 ## 3. Responsibilities in `internal/`
 
 - `internal/server`: router tree + middlewares (health, protocol routes, Admin/WebUI).
-- `internal/httpapi/openai/*`: OpenAI HTTP surface split into chat, responses, files, embeddings, history, and shared packages.
-- `internal/httpapi/{claude,gemini}`: protocol wrappers only (no duplicated upstream execution).
+- `internal/httpapi/openai/*`: OpenAI HTTP surface split into chat, responses, files, embeddings, history, and shared packages; chat/responses share the promptcompat, stream, and toolcall semantics.
+- `internal/httpapi/{claude,gemini}`: protocol wrappers that normalize into the same prompt compatibility semantics without duplicating upstream execution.
 - `internal/promptcompat`: compatibility core for turning OpenAI/Claude/Gemini requests into DeepSeek web-chat plain-text context.
 - `internal/translatorcliproxy`: structure translation between Claude/Gemini and OpenAI.
 - `internal/deepseek/{client,protocol,transport}`: upstream requests, sessions, PoW adaptation, protocol constants, and transport details.
-- `internal/stream` + `internal/sse`: stream parsing and incremental assembly.
+- `internal/js/chat-stream` + `api/chat-stream.js`: Vercel Node streaming bridge; Go prepare/release owns auth, account lease, and completion payload assembly, while Node relays real-time SSE with Go-aligned finalization and tool sieve semantics.
+- `internal/stream` + `internal/sse`: Go stream parsing and incremental assembly.
 - `internal/toolcall` + `internal/toolstream`: canonical XML tool-call parsing + anti-leak sieve (the only executable format is `<tool_calls>` / `<invoke name="...">` / `<parameter name="...">`).
 - `internal/httpapi/admin/*`: Admin API root assembly plus auth/accounts/config/settings/proxies/rawsamples/vercel/history/devcapture/version resource packages.
 - `internal/chathistory`: server-side conversation history persistence, pagination, detail lookup, and retention policy.
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 24ea5c3..5094ea4 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -102,33 +102,79 @@ ds2api/
 
 ```mermaid
 flowchart LR
-    C[Client/SDK] --> R[internal/server/router.go]
-    R --> OA[OpenAI HTTP API]
-    R --> CA[Claude HTTP API]
-    R --> GA[Gemini HTTP API]
-    R --> AD[Admin HTTP API]
+    C[Client / SDK] --> R[internal/server/router.go]
 
-    CA --> BR[translatorcliproxy]
-    GA --> BR
-    BR --> CORE[internal/httpapi/openai/chat ChatCompletions]
-    OA --> CORE
+    subgraph HTTP[HTTP API surface]
+        OA[internal/httpapi/openai]
+        CHAT[openai/chat]
+        RESP[openai/responses]
+        FILES[openai/files + embeddings]
+        CA[internal/httpapi/claude]
+        GA[internal/httpapi/gemini]
+        AD[internal/httpapi/admin/*]
+        WEB[internal/webui static admin]
+    end
 
-    CORE --> AUTH[internal/auth + config key/account resolver]
-    CORE --> POOL[internal/account queue + concurrency]
-    CORE --> TOOL[internal/toolcall parser + internal/toolstream sieve]
-    CORE --> DS[internal/deepseek/client]
+    subgraph COMPAT[Prompt compatibility core]
+        PC[internal/promptcompat]
+        PROMPT[internal/prompt]
+        HIST[internal/httpapi/openai/history]
+    end
+
+    subgraph RUNTIME[Shared runtime]
+        AUTH[internal/auth]
+        POOL[internal/account queue + concurrency]
+        STREAM[internal/stream + internal/sse]
+        TOOL[internal/toolcall + internal/toolstream]
+        DS[internal/deepseek/client]
+        POW[pow + internal/deepseek/protocol]
+    end
+
+    subgraph NODE[Vercel Node Runtime]
+        NCS[api/chat-stream.js]
+        JS[internal/js/chat-stream + stream-tool-sieve]
+    end
+
+    R --> OA --> CHAT
+    OA --> RESP
+    OA --> FILES
+    R --> CA
+    R --> GA
+    R --> AD
+    R --> WEB
+    R -.Vercel stream.-> NCS
+
+    CA --> PC
+    GA --> PC
+    CHAT --> PC
+    RESP --> PC
+    PC --> PROMPT
+    PC -.长历史.-> HIST
+    PC --> AUTH
+
+    NCS -.Go prepare/release.-> CHAT
+    NCS --> JS
+    JS --> TOOL
+
+    AUTH --> POOL
+    CHAT --> STREAM
+    RESP --> STREAM
+    STREAM --> TOOL
+    POOL --> DS
+    DS --> POW
     DS --> U[DeepSeek upstream]
 ```
 
 ## 3. internal/ 子模块职责
 
 - `internal/server`：路由树和中间件挂载（健康检查、协议入口、Admin/WebUI）。
-- `internal/httpapi/openai/*`：OpenAI HTTP surface，按 chat、responses、files、embeddings、history、shared 拆分。
-- `internal/httpapi/{claude,gemini}`：协议输入输出适配，不重复实现上游调用逻辑。
+- `internal/httpapi/openai/*`：OpenAI HTTP surface，按 chat、responses、files、embeddings、history、shared 拆分；chat/responses 共享 promptcompat、stream、toolcall 等核心语义。
+- `internal/httpapi/{claude,gemini}`：协议输入输出适配，归一到同一套 prompt compatibility 语义，不重复实现上游调用逻辑。
 - `internal/promptcompat`：OpenAI/Claude/Gemini 请求到 DeepSeek 网页纯文本上下文的兼容内核。
 - `internal/translatorcliproxy`：Claude/Gemini 与 OpenAI 结构互转。
 - `internal/deepseek/{client,protocol,transport}`：上游请求、会话、PoW 适配、协议常量与传输层。
-- `internal/stream` + `internal/sse`：流式解析与增量处理。
+- `internal/js/chat-stream` + `api/chat-stream.js`：Vercel Node 流式桥；Go prepare/release 管理鉴权、账号租约和 completion payload，Node 侧负责实时 SSE 转发并保持 Go 对齐的终结态和 tool sieve 语义。
+- `internal/stream` + `internal/sse`：Go 流式解析与增量处理。
 - `internal/toolcall` + `internal/toolstream`：canonical XML 工具调用解析与防泄漏筛分（唯一可执行格式：`<tool_calls>` / `<invoke name="...">` / `<parameter name="...">`）。
 - `internal/httpapi/admin/*`：Admin API 根装配与 auth/accounts/config/settings/proxies/rawsamples/vercel/history/devcapture/version 等资源子包。
 - `internal/chathistory`：服务器端对话记录持久化、分页、单条详情和保留策略。
diff --git a/docs/prompt-compatibility.md b/docs/prompt-compatibility.md
index a84dd0f..6d6301c 100644
--- a/docs/prompt-compatibility.md
+++ b/docs/prompt-compatibility.md
@@ -41,8 +41,8 @@ DS2API 当前的核心思路，不是把客户端传来的 `messages`、`tools`
 
 ```text
 客户端请求
-  -> 协议适配层（OpenAI / Claude / Gemini）
-  -> 统一消息标准化
+  -> HTTP API surface（OpenAI / Claude / Gemini）
+  -> promptcompat 统一消息标准化
   -> tool prompt 注入
   -> DeepSeek 风格 prompt 拼装
   -> 文件收集 / inline 上传 / history split（OpenAI 链路）