fix: migrate deprecated @hey-api/sdk operationId option to operations.nesting

@hey-api/openapi-ts 0.99 deprecates the sdk plugin's boolean operationId
option. operationId: false maps internally to operations: { nesting: 'id' },
so pass the new option directly to silence the deprecation warning while
keeping --noOperationId behavior identical.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011dPzdeZL1kurBr7De3rYKN

Author: TakehiroTada

src/generate.mts

@@ -33,7 +33,10 @@ export async function generate(options: LimitedUserConfig, version: string) {
     formattedOptions.noOperationId
       ? {
           name: "@hey-api/sdk" as const,
-          operationId: false,
+          // `operationId: false` was deprecated in favor of `operations.nesting`
+          operations: {
+            nesting: "id" as const,
+          },
         }
       : "@hey-api/sdk";