feat(cli): bundle only documentation sources (#2480)

The published `vite-plus` package currently copies the entire `docs/`
workspace, including VitePress tooling, images, and deployment
resources.

This PR keeps the existing website source layout—`docs/index.md`,
`docs/config/`, and `docs/guide/`—and changes the CLI build to copy
every `*.md` file recursively from `docs/`, preserving its relative
path. Generated dependency/cache trees and all non-Markdown tooling,
assets, data files, and package metadata stay outside the published
package.

Measured by downloading the actual `vite-plus@0.2.9` tarball from npm,
repacking it unchanged as a normalized baseline, and then replacing only
its docs with this branch:

- npm tarball: 1.05 MB → 516 kB, 538 kB smaller (51.1%)
- bundled docs files: 51 → 40

This reduces the published npm package; the native `vp` executable
itself is unchanged.

🤖 Generated with Codex

Author: liangmiQwQ

packages/cli/build.ts

@@ -910,11 +910,6 @@ export default toolchain;
   console.log(`  Created ./versions (${Object.keys(versions).length} tools)`);
 }
 
-/**
- * Copy the docs source tree into docs/, preserving relative paths.
- * Generated VitePress output and installed dependencies are excluded so the package
- * only ships authoring sources and referenced assets.
- */
 async function copyBundledDocs() {
   console.log('\nCopying bundled docs...');
 
@@ -926,17 +921,22 @@ async function copyBundledDocs() {
     return;
   }
 
-  const skipPrefixes = ['node_modules', '.vitepress/cache', '.vitepress/dist'];
   await rm(docsTargetDir, { recursive: true, force: true });
+  const skipPrefixes = ['node_modules', '.vitepress/cache', '.vitepress/dist'];
   await cp(docsSourceDir, docsTargetDir, {
     recursive: true,
-    filter: (src) => {
-      const rel = relative(docsSourceDir, src).replaceAll('\\', '/');
-      return !skipPrefixes.some((prefix) => rel === prefix || rel.startsWith(`${prefix}/`));
+    filter: (source) => {
+      const relativePath = relative(docsSourceDir, source).replaceAll('\\', '/');
+      return (
+        !skipPrefixes.some(
+          (prefix) => relativePath === prefix || relativePath.startsWith(`${prefix}/`),
+        ) &&
+        (statSync(source).isDirectory() || source.endsWith('.md'))
+      );
     },
   });
 
-  console.log('  Copied docs to docs/ (with paths preserved)');
+  console.log('  Copied Markdown docs to docs/');
 }
 
 async function syncReadmeFromRoot() {