feat(admin): finalizing modular refactoring with testing suite and UI polish

backend/main.py

@@ -6,7 +6,8 @@ from slowapi import Limiter
 from slowapi.util import get_remote_address
 from . import models
 from .database import engine
-from .routers import items, operations, users, categories, admin_db
+from .routers import items, operations, users, categories
+from .routers.admin import backups, config
 from .logger import log
 from .scheduler import scheduler, sync_scheduler_config
 
@@ -87,7 +88,8 @@ app.include_router(items.router)
 app.include_router(operations.router)
 app.include_router(users.router)
 app.include_router(categories.router)
-app.include_router(admin_db.router)
+app.include_router(backups.router)
+app.include_router(config.router)
 
 @app.on_event("startup")
 def startup_event():