feat: Enhance web interface with database integration and callsign management

- Add callsign management module for enhanced aircraft information
- Integrate database status display in web interface
- Update aircraft manager with database-backed callsign resolution
- Enhance user interface with database connectivity indicators
- Add embedded asset management for new database interface components

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

assets/static/css/style.css

@@ -566,6 +566,95 @@ body {
     color: #00ff88 !important;
 }
 
+/* Rich callsign display styles */
+.callsign-display {
+    display: inline-block;
+}
+
+.callsign-display.enriched {
+    display: inline-flex;
+    flex-direction: column;
+    gap: 0.25rem;
+}
+
+.callsign-code {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.25rem;
+}
+
+.airline-code {
+    color: #00ff88 !important;
+    font-weight: 600;
+    font-family: monospace;
+    background: rgba(0, 255, 136, 0.1);
+    padding: 0.1rem 0.3rem;
+    border-radius: 3px;
+    border: 1px solid rgba(0, 255, 136, 0.3);
+}
+
+.flight-number {
+    color: #00a8ff !important;
+    font-weight: 500;
+    font-family: monospace;
+}
+
+.callsign-details {
+    font-size: 0.85rem;
+    opacity: 0.9;
+}
+
+.airline-name {
+    color: #ffd700 !important;
+    font-weight: 500;
+}
+
+.airline-country {
+    color: #cccccc !important;
+    font-size: 0.8rem;
+    opacity: 0.8;
+}
+
+.callsign-display.simple {
+    color: #00ff88 !important;
+    font-family: monospace;
+}
+
+.callsign-display.no-data {
+    color: #888888 !important;
+    font-style: italic;
+}
+
+/* Compact callsign for table view */
+.callsign-compact {
+    color: #00ff88 !important;
+    font-family: monospace;
+    font-weight: 500;
+}
+
+/* Loading state for callsign enhancement */
+.callsign-loading {
+    position: relative;
+}
+
+.callsign-loading::after {
+    content: '⟳';
+    margin-left: 0.25rem;
+    opacity: 0.6;
+    animation: spin 1s linear infinite;
+    font-size: 0.8rem;
+}
+
+@keyframes spin {
+    from { transform: rotate(0deg); }
+    to { transform: rotate(360deg); }
+}
+
+.callsign-enhanced {
+    /* Smooth transition when enhanced */
+    transition: all 0.3s ease;
+}
+
 .popup-details {
     font-size: 0.9rem;
     color: #ffffff !important;