Build backend without tsconfig typeRoots

Use direct tsc flags instead of tsconfig.json to avoid
typeRoots resolution issues with bson.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Laoujin

.github/workflows/playwright.yml

@@ -70,8 +70,8 @@ jobs:
         run: |
           # Remove problematic type definitions that have TS version issues
           rm -rf node_modules/@types/babel__*
-          # Build with skipLibCheck to avoid library type issues
-          npx tsc -p . --skipLibCheck
+          # Remove custom typeRoots and build with default resolution + skipLibCheck
+          npx tsc --outDir ./public --rootDir ./src --skipLibCheck --esModuleInterop --resolveJsonModule --strict
 
       - name: Start backend
         working-directory: ./confac/backend