feat(cli): update scaffold template with server entry and Cloudflare config

[qantrepreneur]

Summary

• Add src/server.ts to scaffold template using the Cloudflare adapter
• Add wrangler.jsonc with basic Workers configuration
• Update build script to vite build --ssr src/server.ts and add deploy script
• Add Register module augmentation to src/app.ts
• Add .jsonc to scaffold text extensions for placeholder replacement

Test plan

• Scaffold tests pass including new .jsonc placeholder test (6/6 passing)
• pnpm lint passes for changed packages (pre-existing playground errors only)
• pnpm check-types passes for @sundayceo/create (pre-existing playground errors only)

Closes #91

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