feat: Add OSINT features (v0.1.2)

- MAC vendor lookup (IEEE OUI database)
- BLE company_id to manufacturer mapping
- Device profile enrichment in API responses
- Export endpoints: devices.csv, devices.json, alerts.csv, probes.csv
- Auto-populate vendor on device creation
- CLI command: flask download-oui
- Makefile target: make oui

13 tests passing

tests/test_utils/test_oui.py

@@ -0,0 +1,18 @@
+"""OUI lookup tests."""
+from esp32_web.utils.oui import _normalize_mac, lookup_vendor
+
+
+def test_normalize_mac():
+    """Test MAC normalization."""
+    assert _normalize_mac('aa:bb:cc:dd:ee:ff') == 'AABBCC'
+    assert _normalize_mac('AA-BB-CC-DD-EE-FF') == 'AABBCC'
+    assert _normalize_mac('aabbccddeeff') == 'AABBCC'
+    assert _normalize_mac('short') == ''
+
+
+def test_lookup_vendor_no_db():
+    """Test vendor lookup without database."""
+    # Should return None when no database loaded
+    result = lookup_vendor('aa:bb:cc:dd:ee:ff')
+    # Result depends on whether OUI db exists
+    assert result is None or isinstance(result, str)