…PC validation
- Introduced full integration test suite for MCP controller, testing
`POST /mcp` with valid and invalid payloads.
- Added `@IsDefined` validation to ensure the `method` field is required
in JSON-RPC requests.
- Applied `RestApiExceptionFilter` to MCP controller for consistent
error handling.
- Enhanced validation pipe in MCP controller to whitelist and reject
non-whitelisted properties.
- Consolidated exception filters in SSOAuthController.