Fix section 404 by rewriting README pages to index.html

Generate VitePress rewrites for subdirectory README.md and simplify Express page resolution.

Co-authored-by: Cursor <cursoragent@cursor.com>

.vitepress/rewrites.mts

@@ -0,0 +1,46 @@
+import fs from 'node:fs'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
+
+const EXCLUDE_DIRS = new Set([
+  'node_modules',
+  '.vitepress',
+  'server',
+  'scripts',
+  'assets',
+  'images',
+  '.git',
+  '金瓶梅',
+  '黄帝内经',
+  '健康学习到150岁 - 人体系统调优不完全指南',
+  '梅花',
+])
+
+export function generateRewrites(): Record<string, string> {
+  const rewrites: Record<string, string> = {}
+
+  function walk(dir: string, relativeDir: string) {
+    for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+      if (entry.isDirectory()) {
+        if (EXCLUDE_DIRS.has(entry.name)) continue
+        walk(path.join(dir, entry.name), path.join(relativeDir, entry.name))
+        continue
+      }
+
+      if (!/readme\.md$/i.test(entry.name)) continue
+
+      const from = path.join(relativeDir, entry.name).replace(/\\/g, '/')
+      const to = from.replace(/README\.md$/i, 'index.md')
+      rewrites[from] = to
+    }
+  }
+
+  for (const entry of fs.readdirSync(root, { withFileTypes: true })) {
+    if (!entry.isDirectory() || EXCLUDE_DIRS.has(entry.name)) continue
+    walk(path.join(root, entry.name), entry.name)
+  }
+
+  return rewrites
+}