feat: major dashboard overhaul and polish

- Switched from mock data to real backend APIs.
- Implemented unified ApiClient for consistent frontend data fetching.
- Refactored dashboard structure and styles for a modern SaaS aesthetic.
- Fixed Axum 0.8+ routing and parameter syntax issues.
- Implemented real client creation/deletion and provider health monitoring.
- Synchronized WebSocket event structures between backend and frontend.

src/logging/mod.rs

@@ -43,8 +43,9 @@ impl RequestLogger {
         tokio::spawn(async move {
             // Broadcast to dashboard
             let _ = tx.send(serde_json::json!({
-                "event_type": "request",
-                "data": log
+                "type": "request",
+                "channel": "requests",
+                "payload": log
             }));
 
             if let Err(e) = Self::insert_log(&pool, log).await {