ci: remove redundant artifact uploads from CI workflow

.gitea/workflows/ci.yml

@@ -121,14 +121,6 @@ jobs:
         env:
           NODE_OPTIONS: --max_old_space_size=4096
 
-      - name: Upload coverage reports
-        uses: actions/upload-artifact@v4
-        if: always()
-        with:
-          name: coverage-report
-          path: coverage/
-          retention-days: 7
-
   # Job 4: Build (depends on tests passing)
   build:
     name: Build Application
@@ -167,13 +159,6 @@ jobs:
         env:
           NODE_OPTIONS: --max_old_space_size=4096
 
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: build-files
-          path: .next/
-          retention-days: 7
-
   # Job 5: Security audit (can run in parallel)
   security-audit:
     name: Security Audit
@@ -189,14 +174,8 @@ jobs:
         with:
           bun-version: ${{ env.BUN_VERSION }}
 
-      - name: Restore node_modules cache
-        uses: actions/cache@v4
-        with:
-          path: node_modules
-          key: node-modules-${{ needs.quick-checks.outputs.cache-key }}
-
-      - name: Install dependencies (if cache miss)
-        run: bun install
+      - name: Install node_modules with yarn lockfile
+        run: bun install --frozen-lockfile --yarn
 
       - name: Run security audit
         run: bun audit --audit-level moderate