Add 2D barcode scanning + connect_id search

- Add QR_CODE, DATA_MATRIX, PDF_417, AZTEC to barcode scanner hints
  so serial number stickers with 2D barcodes can be scanned
- Update /api/assets/search to also match connect_id so full
  Connect IDs (e.g. VM-05912-0000068454) work when scanned
- Bump SW cache v5→v6, footer v3.2→v3.3

server.py

@@ -1129,7 +1129,8 @@ def list_assets(
 def search_by_machine_id(machine_id: str = Query(...)):
     conn = get_db()
     row = conn.execute(
-        "SELECT * FROM assets WHERE machine_id = ?", (machine_id,)
+        "SELECT * FROM assets WHERE machine_id = ? OR connect_id = ?",
+        (machine_id, machine_id),
     ).fetchone()
     conn.close()
     if row is None: