refactor(cli): Share the content-index walk

Extract readContentIndex from buildRegistry so the validator can read raw files while the server keeps the scanned registry, both from one walk.

src/cli/commands/serve.ts

@@ -13,6 +13,7 @@ import {
   deriveCompletions,
   type ContentRegistry,
 } from "../content-registry.js";
+import { readContentIndex } from "../content-index.js";
 import type { CompletionsPayload } from "../completions/types.js";
 
 interface ContentIndex {
@@ -86,39 +87,7 @@ function getBestIP(): string {
  * 扫描目录内的 .md 等文件，构建内容注册表（路径索引 + 每文档内联内容）
  */
 export function buildRegistry(dir: string): ContentRegistry {
-  const index: Record<string, string> = {};
-
-  function scan(currentPath: string, relativePath: string) {
-    const entries = readdirSync(currentPath);
-
-    for (const entry of entries) {
-      if (entry.startsWith(".") || entry === "node_modules") continue;
-
-      const fullPath = join(currentPath, entry);
-      const relPath = relativePath ? join(relativePath, entry) : entry;
-      const normalizedRelPath = normalizePathKey(relPath);
-
-      const stats = statSync(fullPath);
-      if (stats.isDirectory()) {
-        scan(fullPath, relPath);
-      } else if (
-        entry.endsWith(".md") ||
-        entry.endsWith(".csv") ||
-        entry.endsWith(".yarn") ||
-        entry.endsWith(".svg")
-      ) {
-        try {
-          index[normalizedRelPath] = readFileSync(fullPath, "utf-8");
-        } catch (e) {
-          console.error(`读取文件失败：${fullPath}`, e);
-        }
-      }
-    }
-  }
-
-  scan(dir, "");
-
-  return buildRegistryFromIndex(index);
+  return buildRegistryFromIndex(readContentIndex(dir));
 }
 
 /**