Add Listening Post, improve setup and documentation

- Add Listening Post mode with frequency scanner and audio monitoring
- Add dependency warning for aircraft dashboard listen feature
- Auto-restart audio when switching frequencies
- Fix toolbar overflow on aircraft dashboard custom frequency
- Update setup script with full macOS/Debian support
- Clean up README and documentation for clarity
- Add sox and dump1090 to Dockerfile
- Add comprehensive tool reference to HARDWARE.md
- Add correlation, settings, and database utilities
- Add new test files for routes, validation, correlation, database

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

routes/correlation.py

@@ -0,0 +1,119 @@
+"""Device correlation routes."""
+
+from __future__ import annotations
+
+from flask import Blueprint, jsonify, request, Response
+
+import app as app_module
+from utils.correlation import get_correlations
+from utils.logging import get_logger
+
+logger = get_logger('intercept.correlation')
+
+correlation_bp = Blueprint('correlation', __name__, url_prefix='/correlation')
+
+
+@correlation_bp.route('', methods=['GET'])
+def get_device_correlations() -> Response:
+    """
+    Get device correlations between WiFi and Bluetooth.
+
+    Query params:
+        min_confidence: Minimum confidence threshold (default 0.5)
+        include_historical: Include database correlations (default true)
+    """
+    min_confidence = request.args.get('min_confidence', 0.5, type=float)
+    include_historical = request.args.get('include_historical', 'true').lower() == 'true'
+
+    try:
+        # Get current device data
+        wifi_devices = dict(app_module.wifi_networks)
+        wifi_devices.update(dict(app_module.wifi_clients))
+        bt_devices = dict(app_module.bt_devices)
+
+        # Calculate correlations
+        correlations = get_correlations(
+            wifi_devices=wifi_devices,
+            bt_devices=bt_devices,
+            min_confidence=min_confidence,
+            include_historical=include_historical
+        )
+
+        return jsonify({
+            'status': 'success',
+            'correlations': correlations,
+            'wifi_count': len(wifi_devices),
+            'bt_count': len(bt_devices)
+        })
+    except Exception as e:
+        logger.error(f"Error calculating correlations: {e}")
+        return jsonify({
+            'status': 'error',
+            'message': str(e)
+        }), 500
+
+
+@correlation_bp.route('/analyze', methods=['POST'])
+def analyze_correlation() -> Response:
+    """
+    Analyze specific device pair for correlation.
+
+    Request body:
+        wifi_mac: WiFi device MAC address
+        bt_mac: Bluetooth device MAC address
+    """
+    data = request.json or {}
+    wifi_mac = data.get('wifi_mac')
+    bt_mac = data.get('bt_mac')
+
+    if not wifi_mac or not bt_mac:
+        return jsonify({
+            'status': 'error',
+            'message': 'wifi_mac and bt_mac are required'
+        }), 400
+
+    try:
+        # Get device data
+        wifi_device = app_module.wifi_networks.get(wifi_mac)
+        if not wifi_device:
+            wifi_device = app_module.wifi_clients.get(wifi_mac)
+
+        bt_device = app_module.bt_devices.get(bt_mac)
+
+        if not wifi_device:
+            return jsonify({
+                'status': 'error',
+                'message': f'WiFi device {wifi_mac} not found'
+            }), 404
+
+        if not bt_device:
+            return jsonify({
+                'status': 'error',
+                'message': f'Bluetooth device {bt_mac} not found'
+            }), 404
+
+        # Calculate correlation for this specific pair
+        correlations = get_correlations(
+            wifi_devices={wifi_mac: wifi_device},
+            bt_devices={bt_mac: bt_device},
+            min_confidence=0.0,  # Show even low confidence for analysis
+            include_historical=True
+        )
+
+        if correlations:
+            return jsonify({
+                'status': 'success',
+                'correlation': correlations[0]
+            })
+        else:
+            return jsonify({
+                'status': 'success',
+                'correlation': None,
+                'message': 'No correlation detected between these devices'
+            })
+    except Exception as e:
+        logger.error(f"Error analyzing correlation: {e}")
+        return jsonify({
+            'status': 'error',
+            'message': str(e)
+        }), 500