修复md导入问题

src/app/api/pages/route.ts

@@ -2,33 +2,7 @@
 import { prisma } from '@/lib/prisma';
 import { requireApiAuth } from '@/lib/api-auth';
 import { cleanupAccidentalStandaloneInlineCode, markdownToImportHtml } from '@/lib/markdown-import';
-
-const MAX_TITLE_LENGTH = 200;
-const MAX_TAGS = 20;
-const MAX_TAG_LENGTH = 50;
-
-function safeParseTags(tags: string | null): string[] {
-    if (!tags) return [];
-    try {
-        const parsed = JSON.parse(tags);
-        return Array.isArray(parsed) ? parsed.filter((t): t is string => typeof t === 'string') : [];
-    } catch {
-        return [];
-    }
-}
-
-function normalizeTags(input: unknown): string[] {
-    if (!Array.isArray(input)) return [];
-    const unique = new Set<string>();
-    for (const raw of input) {
-        if (typeof raw !== 'string') continue;
-        const normalized = raw.trim();
-        if (!normalized || normalized.length > MAX_TAG_LENGTH) continue;
-        unique.add(normalized);
-        if (unique.size >= MAX_TAGS) break;
-    }
-    return Array.from(unique);
-}
+import { MAX_TITLE_LENGTH, safeParseTags, normalizeTags } from '@/lib/page-utils';
 
 export async function GET() {
     const authError = await requireApiAuth();