feat: add Vue Router 5 typed routes for TypeScript projects

[MaBbKhawaja]

Summary

Closes #920

When both TypeScript and Vue Router are selected, the scaffolded project now includes Vue Router 5's typed routes configuration out of the box:

• Adds vueRouter() from vue-router/vite as a Vite plugin (using lowercase naming per Vite conventions)
• Configures tsconfig.app.json with typed-router.d.ts include, rootDir, and Volar plugins (sfc-typed-router, sfc-route-blocks)
• Adds typed-router.d.ts to .gitignore (generated file)

This does not add file-based/auto routes — it only enables typed routes for the existing manual route definitions, as discussed in the issue.

Non-TypeScript router projects are unaffected.

Generated output (TypeScript + Router)

vite.config.ts gains:

import vueRouter from 'vue-router/vite'
// ...
plugins: [vueRouter(), vue(), vueDevTools()]

tsconfig.app.json gains:

{
  "include": ["env.d.ts", "src/**/*", "src/**/*.vue", "typed-router.d.ts"],
  "compilerOptions": { "rootDir": "." },
  "vueCompilerOptions": {
    "plugins": ["vue-router/volar/sfc-typed-router", "vue-router/volar/sfc-route-blocks"]
  }
}

Test plan

• Run pnpm run snapshot and verify TypeScript + Router snapshots include the new vite plugin and tsconfig changes
• Run pnpm run test to confirm existing tests pass
• Scaffold a project with --typescript --router and verify typed routes work
• Scaffold a project with --router (no TS) and verify it's unaffected