fix: filter scanner BT MACs during BLE Radar import

- Skip devices whose address matches a registered peer's bt_mac
- Prevents scanners from appearing as regular devices
- Shows count of filtered scanners in import stats

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

src/rf_mapper/import_ble_radar.py

@@ -62,6 +62,18 @@ def import_ble_radar_db(
     if verbose:
         print(f"Importing from: {ble_radar_path}")
 
+    # Get scanner BT MACs to filter out (don't import scanners as devices)
+    scanner_bt_macs = set()
+    peers = rf_mapper_db.get_peers()
+    for peer in peers:
+        if peer.get("bt_mac"):
+            scanner_bt_macs.add(peer["bt_mac"].upper())
+
+    if verbose and scanner_bt_macs:
+        print(f"Filtering {len(scanner_bt_macs)} scanner BT MAC(s)")
+
+    stats["scanners_filtered"] = 0
+
     # Get location data for device-location mapping
     ble_cursor.execute("SELECT time, lat, lng FROM location ORDER BY time")
     locations = {row["time"]: (row["lat"], row["lng"]) for row in ble_cursor.fetchall()}
@@ -85,6 +97,14 @@ def import_ble_radar_db(
     for row in ble_cursor.fetchall():
         try:
             address = row["address"]
+
+            # Skip scanner devices (don't import scanners as regular devices)
+            if address.upper() in scanner_bt_macs:
+                stats["scanners_filtered"] += 1
+                if verbose:
+                    print(f"Skipping scanner: {address}")
+                continue
+
             name = row["custom_name"] or row["name"] or ""
             manufacturer = row["manufacturer_name"] or ""
             rssi = row["last_seen_rssi"] or -70
@@ -147,6 +167,8 @@ def import_ble_radar_db(
         print(f"  Devices updated:  {stats['devices_updated']}")
         print(f"  RSSI records:     {stats['rssi_records']}")
         print(f"  Locations used:   {stats['locations_used']}")
+        if stats.get("scanners_filtered"):
+            print(f"  Scanners skipped: {stats['scanners_filtered']}")
         if stats["errors"]:
             print(f"  Errors:           {stats['errors']}")