Fix: Resolve route conflict - move root JSON endpoint to /api

The root / endpoint in main.py was conflicting with the HTML
  endpoint in auth.router, causing the homepage to return JSON
  instead of rendering the HTML dashboard. Moved API info to /api
  to allow auth.router to properly handle / and /login pages.

ebook_backend&admin_panel/admin-backend/main.py

@@ -313,14 +313,14 @@ async def health_check() -> Dict[str, Any]:
         "database_status": db_status
     }
 
-# Include routers
+# Include routers - auth.router handles / and /login HTML pages
 app.include_router(auth.router, prefix="/auth", tags=["Auth"])
 app.include_router(auth.router, prefix="", tags=["Auth"])
 
-# Root endpoint
-@app.get("/", tags=["Root"])
-async def root() -> Dict[str, Any]:
-    """Root endpoint with API information"""
+# API info endpoint (moved from / to /api to avoid conflict with auth.router)
+@app.get("/api", tags=["API Info"])
+async def api_info() -> Dict[str, Any]:
+    """API information endpoint"""
     return {
         "message": AppConfig.APP_NAME,
         "version": AppConfig.VERSION,