Support @Hidden on enums and object fields read by @MCPTool

Expected Behavior

When adding @Hidden to enum values and fields of objects, the expected behavior is for Spring AI to filter those items from the generated tool inputSchema.

Current Behavior

At the moment, @MCPTool displays all enum values.

Context

The swagger annotation @Hidden is placed on enum values for example to avoid the OpenAPI spec from containing those values. The example below will generated an openapi.json file with currency: USD, CAD.

When viewing the generated tool definition of the below example, it contains all values "enum": ["EUR", "JPY", "USD", "CAD"] exposing fields/values that are not intended to be exposed.

enum Currency {
    @Hidden EUR,
    @Hidden JPY,
            USD,
            CAD
}

@RequireAuthentication
@GetMapping("{currency}")
@Operation(summary = GET_BALANCE_TITLE, description = GET_BALANCE_DESCRIPTION)
@McpTool(title = GET_BALANCE_TITLE, description = GET_BALANCE_DESCRIPTION)
public BalancePayload getBalance(@PathVariable final Currency currency) { ... }

Start by tracing how @McpTool generates its inputSchema, especially enum values and object fields, and compare that path with the existing @Hidden behavior used for OpenAPI. Verify the generated tool schema excludes hidden enum values and fields while retaining visible ones.