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/index.html

@@ -30,6 +30,7 @@
                 <div class="map-controls">
                     <button id="center-map">Center Map</button>
                     <button id="toggle-trails">Toggle Trails</button>
+                    <button id="toggle-history">Show History</button>
                 </div>
                 
                 <div class="legend">
@@ -73,6 +74,7 @@
                             <tr>
                                 <th>Flight</th>
                                 <th>Hex</th>
+                                <th>Type</th>
                                 <th>Altitude</th>
                                 <th>Speed</th>
                                 <th>Track</th>