feat: add comprehensive testing mechanism for dashboard features

- Add smoke test script for post-deployment verification
- Add health monitoring script with Telegram alerts
- Add backend integration tests for conversation tracker API
- Add frontend tests to verify correct API paths
- Update CI/CD workflows to enforce test failures and run smoke tests
- Add comprehensive testing documentation

This testing mechanism will catch issues like the double /api/ prefix bug
before they reach users.

.gitea/workflows/test.yml

@@ -72,6 +72,13 @@ jobs:
             --junit-xml=test-results.xml \
             --cov-fail-under=49
 
+          # Explicitly check exit code
+          if [ $? -ne 0 ]; then
+            echo "❌ Backend tests failed!"
+            exit 1
+          fi
+          echo "✅ Backend tests passed"
+
       - name: Upload coverage report
         if: always()
         run: |
@@ -145,6 +152,13 @@ jobs:
           cd dashboard/frontend
           npm run test:coverage -- --reporter=verbose --run --pool=forks --poolOptions.forks.maxForks=2
 
+          # Explicitly check exit code
+          if [ $? -ne 0 ]; then
+            echo "❌ Frontend tests failed!"
+            exit 1
+          fi
+          echo "✅ Frontend tests passed"
+
   test-summary:
     name: Test Summary
     runs-on: ubuntu-latest