Add SQL query logging and performance improvements

- Implement comprehensive SQL query logging for queries over 10ms
- Add logging wrapper methods for all database operations
- Replace timing code in GetStats with simple info log messages
- Add missing database indexes for better query performance:
  - idx_live_routes_lookup for common prefix/origin/peer lookups
  - idx_live_routes_withdraw for withdrawal updates
  - idx_prefixes_prefix for prefix lookups
  - idx_asn_peerings_lookup for peering relationship queries
- Increase SQLite cache size to 512MB
- Add performance-oriented SQLite pragmas
- Extract HTML templates to separate files using go:embed
- Add JSON response middleware with @meta field (like bgpview.io API)
- Fix concurrent map write errors in HTTP handlers
- Add request timeout handling with proper JSON error responses

These changes significantly improve database query performance and
provide visibility into slow queries for debugging purposes.

internal/templates/status.html

@@ -145,7 +145,17 @@
         function updateStatus() {
             fetch('/api/v1/stats')
                 .then(response => response.json())
-                .then(data => {
+                .then(response => {
+                    // Check if response is an error
+                    if (response.status === 'error') {
+                        document.getElementById('error').textContent = 'Error: ' + response.error.msg;
+                        document.getElementById('error').style.display = 'block';
+                        return;
+                    }
+                    
+                    // Extract data from successful response
+                    const data = response.data;
+                    
                     // Connection status
                     const connectedEl = document.getElementById('connected');
                     connectedEl.textContent = data.connected ? 'Connected' : 'Disconnected';