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

static/js/pages/monitoring.js

@@ -403,7 +403,7 @@ class MonitoringPage {
                 <strong>${request.client_id || 'Unknown'}</strong> → 
                 ${request.provider || 'Unknown'} (${request.model || 'Unknown'})
                 <div class="stream-entry-details">
-                    ${request.tokens || 0} tokens • ${request.duration || 0}ms
+                    ${request.total_tokens || request.tokens || 0} tokens • ${request.duration_ms || request.duration || 0}ms
                 </div>
             </div>
         `;
@@ -493,28 +493,7 @@ class MonitoringPage {
     }
 
     startDemoUpdates() {
-        // Simulate incoming requests for demo purposes
-        if (window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1') {
-            setInterval(() => {
-                if (!this.isPaused && Math.random() > 0.3) { // 70% chance
-                    this.simulateRequest();
-                }
-            }, 2000);
-            
-            // Simulate logs
-            setInterval(() => {
-                if (!this.isPaused && Math.random() > 0.5) { // 50% chance
-                    this.simulateLog();
-                }
-            }, 3000);
-            
-            // Simulate metrics
-            setInterval(() => {
-                if (!this.isPaused) {
-                    this.simulateMetric();
-                }
-            }, 5000);
-        }
+        // Demo updates disabled — real data comes via WebSocket subscriptions
     }
 
     simulateRequest() {