fix: restore RemnaWave config management endpoints

The previous refactoring accidentally deleted RemnaWave API routes
(/remnawave/status, /uuid, /config, /configs) along with the legacy
file-based CRUD routes. Restore only the RemnaWave endpoints that
the cabinet frontend depends on.

app/cabinet/routes/__init__.py

@@ -2,6 +2,7 @@
 
 from fastapi import APIRouter
 
+from .admin_apps import router as admin_apps_router
 from .admin_ban_system import router as admin_ban_system_router
 from .admin_broadcasts import router as admin_broadcasts_router
 from .admin_button_styles import router as admin_button_styles_router
@@ -101,6 +102,7 @@ router.include_router(admin_traffic_router)
 router.include_router(admin_pinned_messages_router)
 router.include_router(admin_button_styles_router)
 router.include_router(admin_channels_router)
+router.include_router(admin_apps_router)
 
 # WebSocket route
 router.include_router(websocket_router)

app/cabinet/routes/admin_apps.py

@@ -0,0 +1,163 @@
+"""Admin routes for managing RemnaWave app configuration."""
+
+import re
+
+import structlog
+from fastapi import APIRouter, Depends, HTTPException, status
+from pydantic import BaseModel
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.config import settings
+from app.database.models import User
+from app.services.remnawave_service import RemnaWaveService
+from app.services.system_settings_service import bot_configuration_service
+
+from ..dependencies import get_cabinet_db, get_current_admin_user
+
+
+logger = structlog.get_logger(__name__)
+
+router = APIRouter(prefix='/admin/apps', tags=['Cabinet Admin Apps'])
+
+
+# ============ Schemas ============
+
+
+class RemnaWaveConfigStatus(BaseModel):
+    """Status of RemnaWave config integration."""
+
+    enabled: bool
+    config_uuid: str | None = None
+
+
+class UpdateRemnaWaveUuidRequest(BaseModel):
+    """Request to update RemnaWave config UUID."""
+
+    uuid: str | None = None
+
+
+# ============ Helpers ============
+
+_UUID_PATTERN = re.compile(r'^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$')
+
+
+def _get_remnawave_config_uuid() -> str | None:
+    """Get RemnaWave config UUID from system settings or env."""
+    try:
+        return bot_configuration_service.get_current_value('CABINET_REMNA_SUB_CONFIG')
+    except Exception:
+        return settings.CABINET_REMNA_SUB_CONFIG
+
+
+# ============ Routes ============
+
+
+@router.get('/remnawave/status', response_model=RemnaWaveConfigStatus)
+async def get_remnawave_config_status(
+    admin: User = Depends(get_current_admin_user),
+):
+    """Get RemnaWave config integration status."""
+    config_uuid = _get_remnawave_config_uuid()
+    return RemnaWaveConfigStatus(
+        enabled=bool(config_uuid),
+        config_uuid=config_uuid,
+    )
+
+
+@router.put('/remnawave/uuid', response_model=RemnaWaveConfigStatus)
+async def set_remnawave_config_uuid(
+    request: UpdateRemnaWaveUuidRequest,
+    admin: User = Depends(get_current_admin_user),
+    db: AsyncSession = Depends(get_cabinet_db),
+):
+    """Set RemnaWave subscription config UUID."""
+    uuid_value = request.uuid.strip() if request.uuid else None
+
+    if uuid_value and not _UUID_PATTERN.match(uuid_value):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail='Invalid UUID format',
+        )
+
+    try:
+        await bot_configuration_service.set_value(db, 'CABINET_REMNA_SUB_CONFIG', uuid_value)
+        await db.commit()
+
+        from app.handlers.subscription.common import invalidate_app_config_cache
+
+        invalidate_app_config_cache()
+        logger.info('Admin updated CABINET_REMNA_SUB_CONFIG', admin_id=admin.id, uuid_value=uuid_value)
+    except Exception as e:
+        logger.error('Error saving RemnaWave config UUID', error=e)
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail='Failed to save configuration',
+        )
+
+    return RemnaWaveConfigStatus(
+        enabled=bool(uuid_value),
+        config_uuid=uuid_value,
+    )
+
+
+@router.get('/remnawave/config')
+async def get_remnawave_subscription_config(
+    admin: User = Depends(get_current_admin_user),
+):
+    """Fetch subscription page config from RemnaWave panel."""
+    config_uuid = _get_remnawave_config_uuid()
+    if not config_uuid:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail='RemnaWave subscription config is not configured',
+        )
+
+    try:
+        service = RemnaWaveService()
+        async with service.get_api_client() as api:
+            config = await api.get_subscription_page_config(config_uuid)
+            if not config:
+                raise HTTPException(
+                    status_code=status.HTTP_404_NOT_FOUND,
+                    detail='Subscription config not found',
+                )
+
+            return {
+                'uuid': config.uuid,
+                'name': config.name,
+                'view_position': config.view_position,
+                'config': config.config,
+            }
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error('Error fetching RemnaWave config', error=e)
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail='Failed to fetch config from RemnaWave',
+        )
+
+
+@router.get('/remnawave/configs')
+async def list_remnawave_subscription_configs(
+    admin: User = Depends(get_current_admin_user),
+):
+    """List available subscription page configs from RemnaWave panel."""
+    try:
+        service = RemnaWaveService()
+        async with service.get_api_client() as api:
+            configs = await api.get_subscription_page_configs()
+            return [
+                {
+                    'uuid': c.uuid,
+                    'name': c.name,
+                    'view_position': c.view_position,
+                }
+                for c in configs
+            ]
+    except Exception as e:
+        logger.error('Error listing RemnaWave configs', error=e)
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail='Failed to fetch configs from RemnaWave',
+        )