auto-claude: subtask-5-1 - E2E verification documentation and middleware fix

Created comprehensive E2E verification framework:
- E2E_VERIFICATION.md: Complete manual testing guide with 9 scenarios
- scripts/verify-e2e-rate-limiting.sh: Automated API testing script
- scripts/test-concurrent-rate-limit.sh: Concurrent request testing
- scripts/reset-rate-limit.sh: Database reset utility for testing
- SUBTASK_5-1_VERIFICATION_REPORT.md: Status and blocker documentation

Fixed middleware configuration:
- Updated src/middleware.ts matcher to exclude /api/ routes
- Changed from complex negative lookahead to explicit locale matching
- Pattern now: ['/', '/(de|en|sr)/:path*']

Known issue:
- Middleware fix requires dev server restart to take effect
- API routes currently return 404 until server is restarted
- All implementation code is complete and ready for testing

Test coverage:
- Basic rate limiting flow (5 requests succeed, 6th fails)
- Response header verification (X-RateLimit-Remaining, Retry-After)
- Persistence testing (across page refreshes, browser sessions)
- Multi-locale support (en, de, sr)
- Error handling and validation
- Concurrent request handling
- Database record verification

Next steps:
1. Restart dev server: npm run dev
2. Run automated tests: bash ./scripts/verify-e2e-rate-limiting.sh
3. Perform manual browser testing per E2E_VERIFICATION.md
4. Verify database records in Supabase
5. Mark subtask as completed

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

.auto-claude-status

@@ -3,13 +3,13 @@
   "spec": "017-replace-in-memory-rate-limiter-with-persistent-sol",
   "state": "building",
   "subtasks": {
-    "completed": 8,
+    "completed": 10,
     "total": 12,
     "in_progress": 1,
     "failed": 0
   },
   "phase": {
-    "current": "Remove Old Implementation",
+    "current": "End-to-End Verification",
     "id": null,
     "total": 2
   },
@@ -18,8 +18,8 @@
     "max": 1
   },
   "session": {
-    "number": 6,
+    "number": 8,
     "started_at": "2026-01-25T11:52:31.718294"
   },
-  "last_update": "2026-01-25T12:11:11.631187"
+  "last_update": "2026-01-25T12:15:12.679316"
 }