feat: Phase 3 Tasks 23-25 + Quality-Gate-Fixes

Task 23: Worker-Intake-Pipeline verbinden
- ergebnis-Feld in Submission/Payload
- worker.py extrahiert + worker_loop refactor
- test_worker.py mit VerarbeiteSubmission/WorkerLoop tests

Task 24: Admin-Stats mit echten Daten
- processed_total, uptime, error_rate, VERSION
- admin_health mit Redis-Live-Daten

Task 25: E2E-Integrationstest + worker_refaktorisiert

Quality-Gate-Fixes:
- consumername Collision: 'worker-1' -> f'worker-{id(self)}'
- fakeredis block=0 Timeout fix
- WhatsApp/Telegram webhook payload fixes
- test_telegram/integration/e2e/refaktorisiert
- handler.py recovery nach corrupted Patch

tests/conftest.py

@@ -3,19 +3,20 @@
 from __future__ import annotations
 
 import sys
-import unittest.mock as mock
+from unittest import mock
 
 import fakeredis
 import pytest
+
+# --- Fake redis module that provides real-like exceptions ---
+import redis as _real_redis
+
 from src.database import Base, _engine
 
 
-# --- Fake redis module that provides real-like exceptions ---
-
-import redis as _real_redis
-
 class _FakeRedis:
     """Wraps fakeredis with the correct redis.exceptions hierarchy."""
+
     @staticmethod
     def exceptions():
         return _real_redis.exceptions
@@ -26,10 +27,6 @@ class _FakeRedis:
     def __getattr__(self, name):
         return getattr(self._conn, name)
 
-    @property
-    def exceptions(self):
-        return _real_redis.exceptions
-
 
 # Install BEFORE any app code runs
 sys.modules["redis"] = mock.MagicMock()