feat: node.js subpath imports

[dotnize]

Following #77, since we already use #/* for the tsconfig path alias.

Switch from TypeScript path aliases to standard built-in Node.js subpath imports, which are now supported by the shadcn CLI.

This uses the recommended explicit subpath mapping:

// package.json
{
  "imports": {
    "#/*": "./src/*"
  }
}

Because Node.js subpath imports do not perform extension or directory-index resolution, internal #/ imports now include their TypeScript file extensions and explicitly reference index.ts files where applicable:

import { env } from "#/env/server.ts"; // src/env/server.ts
import * as schema from "#/lib/db/schema/index.ts"; // src/lib/db/schema/index.ts
import { Button } from "#/components/ui/button.tsx"; // src/components/ui/button.tsx

TypeScript is configured with allowImportingTsExtensions;

// tsconfig.json
{
  "compilerOptions": {
    "allowImportingTsExtensions": true,
  }
}

This keeps a single catch-all alias while following the explicit Node.js subpath-imports model. It avoids relying on array targets to emulate extension guessing: every import maps directly to the file identified by its specifier.

References

• https://ui.shadcn.com/docs/package-imports
• https://nodejs.org/api/packages.html#subpath-imports
• module: allow subpath imports that start with #/ nodejs/node#60864
• https://www.typescriptlang.org/docs/handbook/release-notes/typescript-6-0.html#subpath-imports-starting-with-

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