feat: add mqtt raw data management with UTC+8 range UI

frontend/src/components/Sidebar/AppSidebar.tsx

@@ -1,4 +1,4 @@
-import { Home, MapPin, Satellite, Users } from "lucide-react"
+import { FileDown, Home, MapPin, Satellite, Users } from "lucide-react"
 
 import { SidebarAppearance } from "@/components/Common/Appearance"
 import { Logo } from "@/components/Common/Logo"
@@ -16,6 +16,7 @@ const baseItems: Item[] = [
   { icon: Home, title: "Dashboard", path: "/" },
   { icon: MapPin, title: "Locations", path: "/locations" },
   { icon: Satellite, title: "GNSS Monitor", path: "/gnss-monitor" },
+  { icon: FileDown, title: "MQTT Raw", path: "/mqtt-raw" },
 ]
 
 export function AppSidebar() {