feat(admin): 用户行为分析看板——/admin/api/v1/users（列表/详情，identity 掩码后输出）、/events（多维过滤分页）、/stats/overview（按天×事件 PV 透视+活跃序列）；X-Admin-Token 鉴权沿用现有 admin 装配

apps/admin/app.py

@@ -12,7 +12,7 @@ from contextlib import asynccontextmanager
 
 from fastapi import FastAPI
 
-from apps.admin.routers import assets, gaps, kb, rules
+from apps.admin.routers import assets, gaps, kb, rules, stats, users
 from packages.shared.config import Settings, get_settings
 from packages.shared.db import dispose_engine, get_session_factory
 from packages.shared.handlers import install_exception_handlers
@@ -71,7 +71,8 @@ def create_admin_app(settings: Settings | None = None) -> FastAPI:
     setup_tracing(app, cfg)
 
     if deployed:
-        for router in (kb.router, rules.router, assets.router, gaps.router):
+        routers = (kb.router, rules.router, assets.router, gaps.router, users.router, stats.router)
+        for router in routers:
             app.include_router(router, prefix=ADMIN_API_PREFIX)
     else:
         logger.warning(