feat: add automated test cleanup infrastructure

- Add cleanup-tests.sh script for automated test reorganization
- Safely backup manual test files with timestamps in tests/.backup/
- Generate cleanup-report.json with migration metrics
- Validate test structure after cleanup
- Log detailed cleanup progress and results

Enables safe migration from manual to automated testing

tests/cleanup-report.json

@@ -0,0 +1,30 @@
+{
+  "cleanup_date": "2025-09-08T08:20:49Z",
+  "removed_files": ["manual/admin-login-debug.js", "manual/auth-db-debug.js", "manual/debug-email-validation.js"],
+  "added_files": [
+    "__mocks__/index.js",
+    "e2e/auth-debug.spec.ts",
+    "e2e/test-utils.ts",
+    "integration/run-integration.sh",
+    "README-CLEANUP.md"
+  ],
+  "optimizations": {
+    "removed_manual_tests": 3,
+    "added_automated_tests": 1,
+    "consolidated_mocks": true,
+    "added_test_utilities": true,
+    "improved_documentation": true
+  },
+  "test_count_before": {
+    "manual": 3,
+    "e2e": 5,
+    "integration": 1,
+    "unit": "variable"
+  },
+  "test_count_after": {
+    "manual": 0,
+    "e2e": 6,
+    "integration": 1,
+    "unit": "variable"
+  }
+}