Add filesystem scan trigger and version badge features

Implements optional filesystem scan triggering for Plex and Audiobookshelf after file organization, with new settings in the admin UI, setup wizard, and API. Updates documentation to reflect scan trigger options and improved file organization/cleanup logic. Refactors dropdown menus to use smart positioning and portals for better UX. Adds a version API route and a VersionBadge component to display build info in the header. Updates Docker build to inject version metadata.

src/lib/services/audiobookshelf/api.ts

@@ -92,9 +92,33 @@ export async function searchABSItems(libraryId: string, query: string) {
 
 /**
  * Trigger a library scan
+ * Note: This endpoint returns plain text "OK" instead of JSON
  */
 export async function triggerABSScan(libraryId: string) {
-  await absRequest(`/libraries/${libraryId}/scan`, { method: 'POST' });
+  const configService = getConfigService();
+  const serverUrl = await configService.get('audiobookshelf.server_url');
+  const apiToken = await configService.get('audiobookshelf.api_token');
+
+  if (!serverUrl || !apiToken) {
+    throw new Error('Audiobookshelf not configured');
+  }
+
+  const url = `${serverUrl.replace(/\/$/, '')}/api/libraries/${libraryId}/scan`;
+
+  const response = await fetch(url, {
+    method: 'POST',
+    headers: {
+      'Authorization': `Bearer ${apiToken}`,
+      'Content-Type': 'application/json',
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`ABS API error: ${response.status} ${response.statusText}`);
+  }
+
+  // Endpoint returns plain text "OK", not JSON - don't try to parse it
+  await response.text();
 }
 
 /**