feat(v2): integrate command explain functionality with SQL formatting and analysis

- Added `sql-formatter` dependency for SQL formatting.
- Implemented `ExplainResultPanel` component for displaying SQL explain results.
- Enhanced `RecordCreateDialog` and `RecordUpdateDialog` to include explain functionality.
- Introduced command explain service and analyzers for create, update, and delete operations.
- Updated HTTP contract to include explain endpoints for create, update, and delete commands.
- Registered command explain module in the container node setup.

Author: nichenqin

apps/playground/package.json

@@ -86,6 +86,7 @@
     "react-json-view-lite": "^2.5.0",
     "sharedb": "4.1.2",
     "sonner": "1.7.3",
+    "sql-formatter": "^15.4.10",
     "tailwind-merge": "^3.0.2",
     "tailwindcss": "^4.0.6",
     "ts-pattern": "5.1.1",