chore(deploy): drop Vercel node runtime pin and bump Docker node

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20 AS webui-builder
+FROM node:24 AS webui-builder
 
 WORKDIR /app/webui
 COPY webui/package.json webui/package-lock.json ./
@@ -6,7 +6,7 @@ RUN npm ci
 COPY webui ./
 RUN npm run build
 
-FROM golang:1.24 AS go-builder
+FROM golang:1.26 AS go-builder
 WORKDIR /app
 ARG TARGETOS
 ARG TARGETARCH

zeabur.yaml

@@ -12,6 +12,9 @@ spec:
   readme: |-
     # DS2API (Zeabur)
 
+    ## Runtime baseline
+    - Go: 1.26
+
     ## After deployment
     - Admin panel: `/admin`
     - Health check: `/healthz`