feat: add /user/install webhook + exclude admins from third-party API tasks

- Add POST /user/install endpoint handling Evotor app install/uninstall
  events: uninstall suspends the user and marks connection offline;
  reinstall reactivates a suspended account
- Exclude admin and system role users from refresh_catalog,
  refresh_vk_catalog, and mirror_to_vk periodic tasks by joining users
  table and filtering role = 'user'

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/routes/evotor_webhooks.py

@@ -4,6 +4,7 @@ Evotor webhook endpoints.
 POST /user/create   — Evotor creates a new subscriber; we create/link a local user and return a token.
 POST /user/verify   — Evotor verifies credentials for a user trying to log in via the Evotor interface.
 POST /user/token    — Evotor sends us its own API token for the user.
+POST /user/install  — Evotor notifies about app install or uninstall for a user.
 """
 import json
 import logging
@@ -267,3 +268,51 @@ async def user_token(request: Request, db: Session = Depends(get_db)):
     db.commit()
 
     return JSONResponse({})
+
+
+@router.post("/user/install")
+async def user_install(request: Request, db: Session = Depends(get_db)):
+    """Handle app install / uninstall events from Evotor."""
+    if not _verify_secret(request):
+        return JSONResponse({"error": "Unauthorized"}, status_code=401)
+
+    try:
+        body = await request.json()
+    except Exception:
+        return JSONResponse({"error": "Invalid JSON"}, status_code=400)
+
+    evotor_user_id: str = body.get("userId", "")
+    event_type: str = body.get("type", "").lower()  # "install" or "uninstall"
+
+    if not evotor_user_id:
+        return JSONResponse({"error": "userId required"}, status_code=400)
+
+    logger.info("user/install event type=%s userId=%s", event_type, evotor_user_id)
+
+    user = db.query(User).filter(User.evotor_user_id == evotor_user_id).first()
+    if not user:
+        # Unknown user — nothing to act on, but acknowledge the event
+        return JSONResponse({})
+
+    now = datetime.now(timezone.utc).replace(tzinfo=None)
+
+    if event_type == "uninstall":
+        user.status = UserStatusEnum.suspended
+        user.updated_at = now
+        conn = db.query(EvotorConnection).filter(
+            EvotorConnection.evotor_user_id == evotor_user_id
+        ).first()
+        if conn:
+            conn.is_online = False
+            conn.updated_at = now
+        db.commit()
+        logger.info("user suspended on uninstall: userId=%s", evotor_user_id)
+
+    elif event_type == "install":
+        if user.status == UserStatusEnum.suspended:
+            user.status = UserStatusEnum.active
+            user.updated_at = now
+            db.commit()
+            logger.info("user reactivated on reinstall: userId=%s", evotor_user_id)
+
+    return JSONResponse({})