fix: upgrade startup script controls

backend/app/db/session.py

@@ -60,6 +60,28 @@ async def seed_default_datasources(session: AsyncSession):
     await session.commit()
 
 
+async def ensure_default_admin_user(session: AsyncSession):
+    from app.core.security import get_password_hash
+    from app.models.user import User
+
+    result = await session.execute(
+        text("SELECT id FROM users WHERE username = 'admin'")
+    )
+    if result.fetchone():
+        return
+
+    session.add(
+        User(
+            username="admin",
+            email="admin@planet.local",
+            password_hash=get_password_hash("admin123"),
+            role="super_admin",
+            is_active=True,
+        )
+    )
+    await session.commit()
+
+
 async def init_db():
     import app.models.user  # noqa: F401
     import app.models.gpu_cluster  # noqa: F401
@@ -68,6 +90,7 @@ async def init_db():
     import app.models.datasource  # noqa: F401
     import app.models.datasource_config  # noqa: F401
     import app.models.alert  # noqa: F401
+    import app.models.bgp_anomaly  # noqa: F401
     import app.models.collected_data  # noqa: F401
     import app.models.system_setting  # noqa: F401
 
@@ -125,3 +148,4 @@ async def init_db():
 
     async with async_session_factory() as session:
         await seed_default_datasources(session)
+        await ensure_default_admin_user(session)