Fix Vercel backend deployment configuration

- Update backend/vercel.json to build from TypeScript source
- Fix root vercel.json for frontend-only deployment
- Remove VITE_API_URL from GitHub Actions build step
- Update frontend .env with production comments

Author: rianino

.github/workflows/deploy.yml

@@ -51,8 +51,6 @@ jobs:
         run: npm run lint
 
       - name: Build all components
-        env:
-          VITE_API_URL: ${{ secrets.VITE_API_URL }}
         run: npm run build
 
       - name: Test backend build

.gitignore

@@ -30,3 +30,4 @@ backend/.env
 *.njsproj
 *.sln
 *.sw?
+.vercel

backend/tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "target": "ES2022",
     "module": "commonjs",
-    "lib": ["ES2022", "DOM"],
+    "lib": ["ES2022"],
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,

backend/vercel.json

@@ -2,21 +2,22 @@
   "version": 2,
   "builds": [
     {
-      "src": "dist/index.js",
+      "src": "src/index.ts",
       "use": "@vercel/node"
     }
   ],
   "routes": [
-    {
-      "src": "/api/(.*)",
-      "dest": "/dist/index.js"
-    },
     {
       "src": "/(.*)",
-      "dest": "/dist/index.js"
+      "dest": "src/index.ts"
     }
   ],
   "env": {
     "NODE_ENV": "production"
+  },
+  "functions": {
+    "src/index.ts": {
+      "maxDuration": 10
+    }
   }
 }