fix(cli): resolve ESM module resolution for tsx dev mode

- Remove "type": "module" from apps/cli/package.json to avoid
  ESM/CJS interop issues with workspace packages in tsx dev mode
- Configure tsup to output .mjs files (always treated as ESM by Node.js)
- Rename bin entry from chatlab.js to chatlab.mjs
- Change chatlab web default port to 3100 (serve keeps 3110)
- Fix vite plugin: use pnpm instead of npx for tsx invocation

apps/cli/bin/chatlab.js

@@ -1,2 +0,0 @@
-#!/usr/bin/env node
-import('../dist/cli.js').then((m) => m.run())

apps/cli/bin/chatlab.mjs

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+import('../dist/cli.mjs').then((m) => m.run())