feat: per-source .md sidecar toggles, Picdrop folder-list diagnostic, fast JPEG fullscreen preview + thumb-first, thumbnail backfill

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XNQ8ghPfzAfsyVYd6HgFb6

src/pages/api/admin/picdrop-ls.ts

@@ -0,0 +1,36 @@
+import type { APIRoute } from 'astro';
+import posixpath from 'node:path/posix';
+import { loadConfig } from '../../../lib/picdrop';
+
+export const prerender = false;
+const json = (b: unknown, s = 200) =>
+  new Response(JSON.stringify(b), { status: s, headers: { 'Content-Type': 'application/json' } });
+
+/** Diagnose: listet einen Picdrop-Ordner (Standard: Basisordner). Body { path? } */
+export const POST: APIRoute = async ({ request }) => {
+  const b = await request.json().catch(() => ({} as any));
+  const cfg = await loadConfig();
+  if (!cfg) return json({ error: 'Picdrop nicht konfiguriert.' }, 400);
+  const path = b.path || cfg.basePath || '/';
+  try {
+    if (cfg.protocol === 'sftp') {
+      const SftpClient = (await import('ssh2-sftp-client')).default;
+      const c = new SftpClient();
+      await c.connect({ host: cfg.host, port: cfg.port, username: cfg.user, password: cfg.password, readyTimeout: 15000 });
+      try {
+        const list = await c.list(path);
+        return json({ path, entries: list.map((e: any) => ({ name: e.name, type: e.type, size: e.size })) });
+      } finally { await c.end(); }
+    } else {
+      const { Client } = await import('basic-ftp');
+      const c = new Client(15000);
+      await c.access({ host: cfg.host, port: cfg.port, user: cfg.user, password: cfg.password, secure: true });
+      try {
+        const list = await c.list(path);
+        return json({ path, entries: list.map((e: any) => ({ name: e.name, type: e.type, size: e.size })) });
+      } finally { c.close(); }
+    }
+  } catch (e: any) {
+    return json({ path, error: e?.message || 'Listing fehlgeschlagen.' });
+  }
+};