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/test_telegram.py

@@ -14,11 +14,11 @@ class TestTelegramWebhook:
         """Erstellt Flask-App mit mocktem QueueHandler."""
         self.app = Flask(__name__)
         self.app.queue_handler = MagicMock()
-        self.app.register_blueprint(telegram_bp, url_prefix="/webhook")
+        self.app.register_blueprint(telegram_bp)
         self.client = self.app.test_client()
 
     def test_post_mit_gueltigem_payload(self) -> None:
-        """POST mit gültigem Payload → 200."""
+        """POST mit gültigem Payload -> 200."""
         payload = {
             "message": {
                 "message_id": "msg123",
@@ -28,22 +28,21 @@ class TestTelegramWebhook:
         }
         response = self.client.post(
             "/webhook/telegram",
-            data=payload,
-            content_type="application/json",
+            json=payload,
         )
         assert response.status_code == 200
         data = response.get_json()
         assert data["status"] == "accepted"
 
     def test_post_ohne_json(self) -> None:
-        """POST ohne JSON → 400."""
+        """POST ohne JSON -> 400."""
         response = self.client.post("/webhook/telegram", data="nicht JSON")
         assert response.status_code == 400
         data = response.get_json()
         assert "error" in data
 
     def test_post_ohne_message_id(self) -> None:
-        """POST ohne message_id → 400."""
+        """POST ohne message_id -> 400."""
         payload = {
             "message": {
                 "chat": {"id": "123"},
@@ -60,7 +59,7 @@ class TestTelegramWebhook:
         assert "error" in data
 
     def test_post_mit_leerem_text(self) -> None:
-        """POST mit leerem text → 400."""
+        """POST mit leerem text -> 400."""
         payload = {
             "message": {
                 "message_id": "msg456",