feat: Enhance DeepSeek API compatibility by updating SSE parsing, standardizing error responses, and improving API key management in the tester UI.

webui/src/locales/en.json

@@ -145,6 +145,8 @@
         "apiKeyOptional": "API Key (optional)",
         "apiKeyDefault": "Default: ...{suffix}",
         "apiKeyPlaceholder": "Enter a custom key",
+        "modeManaged": "Managed key mode (uses account pool).",
+        "modeDirect": "Direct token mode (requires a valid DeepSeek token).",
         "statusError": "Error",
         "reasoningTrace": "Reasoning Trace",
         "generating": "Generating response...",
@@ -234,4 +236,4 @@
             "four": "Trigger a redeploy to apply the updated environment variables."
         }
     }
-}
+}

webui/src/locales/zh.json

@@ -145,6 +145,8 @@
         "apiKeyOptional": "API 密钥 (可选)",
         "apiKeyDefault": "默认: ...{suffix}",
         "apiKeyPlaceholder": "输入自定义密钥",
+        "modeManaged": "当前使用托管 key 模式（会走账号池）。",
+        "modeDirect": "当前使用直通 token 模式（需填写有效 DeepSeek token）。",
         "statusError": "错误",
         "reasoningTrace": "思维链过程",
         "generating": "正在生成响应...",
@@ -234,4 +236,4 @@
             "four": "触发重新部署以应用新的环境变量。"
         }
     }
-}
+}