Telegram-Kanaele als Quelle: Parser, Pipeline, UI-Checkbox, Validate-Endpoint

- Neuer source_type telegram_channel in models.py (Source + Incident)
- DB-Migration: include_telegram Spalte fuer incidents
- feeds/telegram_parser.py: Telethon-basierter Parser (analog RSS)
- Orchestrator: Telegram-Pipeline parallel zu RSS + WebSearch
- sources.py: POST /api/sources/telegram/validate Endpoint
- incidents.py: include_telegram in Create/Update/Response
- dashboard.html: Telegram-Checkbox + Filter-Option
- app.js: FormData, EditModal, SourceStats, TypeLabels
- config.py: TELEGRAM_API_ID, API_HASH, SESSION_PATH
- requirements.txt: telethon hinzugefuegt

src/routers/incidents.py

@@ -20,7 +20,7 @@ router = APIRouter(prefix="/api/incidents", tags=["incidents"])
 
 INCIDENT_UPDATE_COLUMNS = {
     "title", "description", "type", "status", "refresh_mode",
-    "refresh_interval", "retention_days", "international_sources", "visibility",
+    "refresh_interval", "retention_days", "international_sources", "include_telegram", "visibility",
 }
 
 
@@ -105,9 +105,9 @@ async def create_incident(
     now = datetime.now(TIMEZONE).strftime('%Y-%m-%d %H:%M:%S')
     cursor = await db.execute(
         """INSERT INTO incidents (title, description, type, refresh_mode, refresh_interval,
-           retention_days, international_sources, visibility,
+           retention_days, international_sources, include_telegram, visibility,
            tenant_id, created_by, created_at, updated_at)
-           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
+           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)""",
         (
             data.title,
             data.description,
@@ -116,6 +116,7 @@ async def create_incident(
             data.refresh_interval,
             data.retention_days,
             1 if data.international_sources else 0,
+            1 if data.include_telegram else 0,
             data.visibility,
             tenant_id,
             current_user["id"],
@@ -721,6 +722,7 @@ def _build_json_export(
             "updated_at": incident.get("updated_at"),
             "summary": incident.get("summary"),
             "international_sources": bool(incident.get("international_sources")),
+            "include_telegram": bool(incident.get("include_telegram")),
         },
         "sources": sources,
         "fact_checks": [