fix(turbo-gen): annotate answers param + add tsconfig for generators dir

Two diagnostics from the IDE on turbo/generators/config.ts:

1. `Cannot find module '@turbo/gen'` — there was no tsconfig in
   turbo/generators/, so the IDE was opening config.ts in loose mode
   without proper module resolution context. Added a small
   tsconfig.json that extends tsconfig.base, sets NodeNext module
   resolution, and includes only ./**/*.ts (templates excluded).

2. `Parameter 'answers' implicitly has an 'any' type` — annotated
   the printNextSteps custom-action function param as
   `Record<string, unknown>` (Plop's runtime answers shape). The
   inner cast to the typed Answers shape was already in place.

`npx tsc --noEmit -p turbo/generators/tsconfig.json` is now clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

turbo/generators/config.ts

@@ -279,7 +279,7 @@ export default function generator(plop: PlopTypes.NodePlopAPI): void {
       },
 
       // Final manual-wiring instructions printed to the user
-      function printNextSteps(answers): string {
+      function printNextSteps(answers: Record<string, unknown>): string {
         const a = answers as { name: string; entity: string; entityPlural: string };
         const kebab = a.name;
         const constSym = a.name.toUpperCase().replace(/-/g, "_");