fix: resolve /api/api doubled path in Docker deployment

- Remove VITE_PB_URL=/api from Dockerfile (SDK auto-appends /api)
- Fix nginx proxy_pass to keep /api/ prefix for PocketBase
- Update pocketbase.ts fallback to window.location.origin
- Update PocketBase proxy target to port 8090

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/Dockerfile

@@ -11,7 +11,7 @@ RUN npm ci
 COPY . .
 
 # 设置构建参数并构建（默认使用相对路径，由 nginx 代理）
-ARG VITE_PB_URL=/api
+ARG VITE_PB_URL=
 ENV VITE_PB_URL=$VITE_PB_URL
 
 RUN npm run build

frontend/nginx.conf

@@ -14,7 +14,7 @@ server {
 
     # API 代理到局域网 PocketBase
     location /api/ {
-        proxy_pass http://192.168.1.14:8711/;
+        proxy_pass http://192.168.1.14:8090;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';

frontend/src/api/pocketbase.ts

@@ -1,7 +1,7 @@
 // src/api/pocketbase.ts
 import PocketBase from 'pocketbase'
 
-const pbUrl = import.meta.env.VITE_PB_URL || 'http://localhost:8090'
+const pbUrl = import.meta.env.VITE_PB_URL || window.location.origin
 
 export const pb = new PocketBase(pbUrl)