Add historical flight track functionality

- Store track history with position, altitude, speed, and timestamp
- Automatic track point collection every 30 seconds when position changes
- API endpoint /api/aircraft/{hex}/history for individual aircraft tracks
- Frontend "Show History" button to display historical flight paths
- Click aircraft markers to show their historical track (dashed red line)
- Track cleanup: keep last 200 points per aircraft, 24-hour retention
- Add aircraft type badges in table view with color coding
- Start/end markers for historical tracks with timestamps

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

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

static/css/style.css

@@ -213,6 +213,20 @@ body {
     background: #404040;
 }
 
+.type-badge {
+    padding: 0.2rem 0.4rem;
+    border-radius: 3px;
+    font-size: 0.7rem;
+    font-weight: bold;
+    color: #000000;
+}
+
+.type-badge.commercial { background: #00ff88; }
+.type-badge.cargo { background: #ff8c00; }
+.type-badge.military { background: #ff4444; }
+.type-badge.ga { background: #ffff00; }
+.type-badge.ground { background: #888888; color: #ffffff; }
+
 .stats-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));