feat(ci): add server build validation to CI workflow

.github/workflows/ci.yml

@@ -98,6 +98,7 @@ jobs:
   test-server:
     name: Test Server
     runs-on: ubuntu-latest
+    needs: [typecheck-server]
     steps:
       - uses: actions/checkout@v6
 
@@ -118,4 +119,30 @@ jobs:
 
       - name: Run unit tests
         run: npm test
+        working-directory: server
+
+  build-server:
+    name: Build Server
+    runs-on: ubuntu-latest
+    needs: [typecheck-server, test-server]
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+          cache: "npm"
+          cache-dependency-path: server/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+        working-directory: server
+
+      - name: Generate Prisma client
+        run: npx prisma generate --schema=src/database/prisma/schema
+        working-directory: server
+
+      - name: Build server
+        run: npm run build
         working-directory: server