Phase 1: Fix all critical release blockers (B1-B10)

B1: Remove duplicate get_redis() — singleton no longer overwritten
B2: Plugin routes now enforce activation status via require_active_plugin()
B3: Fix UploadFile ForwardRef error — remove functools.wraps from wrap_plugin_route
B4: DMS upload uses true streaming via save_stream() instead of RAM accumulation
B5: Worker on_startup registers plugin event handlers + webhook dispatcher
B6: Implement send_password_reset_email job, remove raw token logging
B7: Webhook SSRF protection (IP validation, no redirects), secret removed from response
B8: RLS repair migration 0044 + separate crm_runtime DB user (NOSUPERUSER, NOBYPASSRLS)
B9: Fix .env.docker.example AUTH_SECRET → SECRET_KEY
B10: Remove Redis default password, remove exposed DB/Redis ports

Also: add frontend_url to config, add SMTP settings to .env.docker.example,
update prestart.sh to use MIGRATION_DATABASE_URL for alembic.

app/plugins/builtins/kommunikation/routes.py

@@ -338,7 +338,7 @@ async def delete_msg(
 
 # ─── Attachments ───
 
-@router.post("/messages/{message_id}/attachments", dependencies=[Depends(require_permission("comm:write"))])
+@router.post("/messages/{message_id}/attachments", response_model=None, dependencies=[Depends(require_permission("comm:write"))])
 async def upload_attachment(
     message_id: str,
     file: UploadFile = File(...),