fix(ci): add common-plat checkout for backend, upgrade Node to 22, add concurrency

- Backend: common-plat checkout + pnpm build so @bytelyst/* file: deps resolve
- All jobs: Node 20→22, concurrency group for PR dedup

.github/workflows/ci.yml

@@ -6,31 +6,58 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   backend:
-    name: Backend
+    name: Backend — typecheck + test + build
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: backend
-    env:
-      NODE_ENV: test
-      JWT_SECRET: ci-test-secret
-      DB_PROVIDER: memory
     steps:
       - uses: actions/checkout@v4
+
+      - name: Checkout common-plat (for @bytelyst/* packages)
+        uses: actions/checkout@v4
+        with:
+          repository: saravanakumardb1/learning_ai_common_plat
+          path: learning_ai_common_plat
+          token: ${{ secrets.GH_PAT }}
+
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
-          cache: npm
-          cache-dependency-path: backend/package-lock.json
-      - run: npm ci
-      - run: npm run typecheck
-      - run: npm test
-      - run: npm run build
+          node-version: 22
+
+      - name: Install pnpm (for common-plat build)
+        run: npm install -g pnpm
+
+      - name: Build @bytelyst/* packages
+        working-directory: learning_ai_common_plat
+        run: |
+          pnpm install --frozen-lockfile
+          pnpm build
+
+      - name: Install backend dependencies
+        working-directory: backend
+        run: npm ci
+
+      - name: Backend typecheck
+        working-directory: backend
+        run: npm run typecheck
+
+      - name: Backend tests
+        working-directory: backend
+        run: npm test
+        env:
+          DB_PROVIDER: memory
+          JWT_SECRET: ci-test-secret-at-least-32-characters-long
+
+      - name: Backend build
+        working-directory: backend
+        run: npm run build
 
   web:
-    name: Web
+    name: Web — typecheck + test + build
     runs-on: ubuntu-latest
     defaults:
       run:
@@ -39,7 +66,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: npm
           cache-dependency-path: web/package-lock.json
       - run: npm ci
@@ -48,7 +75,7 @@ jobs:
       - run: npm run build
 
   mobile:
-    name: Mobile Typecheck
+    name: Mobile — typecheck
     runs-on: ubuntu-latest
     defaults:
       run:
@@ -57,7 +84,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: npm
           cache-dependency-path: mobile/package-lock.json
       - run: npm ci