feat(B-RL): Rate-Limiting Konsistenz — zentrale Policies für Auth/AI/Upload/Webhook

B-RL: Rate-Limiting auf zentrale check_rate_limit() umgestellt
- forgejo_error_reporter: In-Memory → zentrale Redis-Rate-Limit
- ai_proactive: eigene Redis-Logik → zentrale check_rate_limit()
- agent_runner: DB-basiertes Limit bleibt (zählt echte Ausführungen)
- RateLimitPolicy Enum (AUTH/AI/UPLOAD/WEBHOOK) + check_rate_limit_policy()
- 8 neue config.py Settings für Policy-Limits
- 12 Routes mit Policies versehen (login, password-reset, AI, uploads, webhooks)

Tests: 20 Tests in test_rate_limit_policies.py — alle grün
- Policies, check_rate_limit, reset, get_client_ip, forgejo, ai_proactive
- Keine Regression: 116 bestehende Tests grün

app/routes/webhooks.py

@@ -4,10 +4,11 @@ from __future__ import annotations
 
 import uuid
 
-from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi import APIRouter, Depends, HTTPException, Query, Request
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.db import get_db
+from app.core.rate_limit import RateLimitPolicy, check_rate_limit_policy
 from app.deps import get_current_user, require_permission
 from app.schemas.webhook import (
     WebhookCreate,
@@ -166,6 +167,7 @@ async def delete_webhook(
 )
 async def test_webhook(
     webhook_id: str,
+    request: Request,
     db: AsyncSession = Depends(get_db),
     current_user: dict = Depends(get_current_user),
 ):
@@ -174,6 +176,12 @@ async def test_webhook(
     user_id = uuid.UUID(current_user["user_id"])
     is_admin = current_user.get("is_system_admin", False)
 
+    # Rate limit — WEBHOOK policy
+    await check_rate_limit_policy(
+        f"rate:webhook:test:{tenant_id}:{user_id}",
+        RateLimitPolicy.WEBHOOK,
+    )
+
     try:
         wh_id = uuid.UUID(webhook_id)
     except (ValueError, TypeError):