fix(dashboard): fix chart crash, field name mismatches, and demo data injection

- overview.js: fix time-series chart crash (data is {series:[...]}, not array; field is 'time' not 'hour')
- monitoring.js: use fallback field names (total_tokens/tokens, duration_ms/duration) for WebSocket vs API compat
- monitoring.js: disable localhost demo data injection that mixed fake data with real
- websocket.js: fix duplicate condition and field name mismatches in dead-code handlers
- logging/mod.rs: add info! logs for successful DB insert and broadcast count for diagnostics

src/logging/mod.rs

@@ -2,7 +2,7 @@ use chrono::{DateTime, Utc};
 use serde::Serialize;
 use sqlx::SqlitePool;
 use tokio::sync::broadcast;
-use tracing::warn;
+use tracing::{info, warn};
 
 use crate::errors::AppError;
 
@@ -42,14 +42,19 @@ impl RequestLogger {
         // Spawn async task to log without blocking response
         tokio::spawn(async move {
             // Broadcast to dashboard
-            let _ = tx.send(serde_json::json!({
+            let broadcast_result = tx.send(serde_json::json!({
                 "type": "request",
                 "channel": "requests",
                 "payload": log
             }));
+            match broadcast_result {
+                Ok(receivers) => info!("Broadcast request log to {} dashboard listeners", receivers),
+                Err(_) => {} // No active WebSocket clients — expected when dashboard isn't open
+            }
 
-            if let Err(e) = Self::insert_log(&pool, log).await {
-                warn!("Failed to log request to database: {}", e);
+            match Self::insert_log(&pool, log).await {
+                Ok(()) => info!("Request logged to database successfully"),
+                Err(e) => warn!("Failed to log request to database: {}", e),
             }
         });
     }