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/app/setup/page.tsx

@@ -43,11 +43,13 @@ interface SetupState {
   plexUrl: string;
   plexToken: string;
   plexLibraryId: string;
+  plexTriggerScanAfterImport: boolean;
 
   // Audiobookshelf config (if mode=audiobookshelf)
   absUrl: string;
   absApiToken: string;
   absLibraryId: string;
+  absTriggerScanAfterImport: boolean;
 
   // Auth config (if mode=audiobookshelf)
   authMethod: 'oidc' | 'manual' | 'both';
@@ -113,11 +115,13 @@ export default function SetupWizard() {
     plexUrl: '',
     plexToken: '',
     plexLibraryId: '',
+    plexTriggerScanAfterImport: false,
 
     // Audiobookshelf config
     absUrl: '',
     absApiToken: '',
     absLibraryId: '',
+    absTriggerScanAfterImport: false,
 
     // Auth config
     authMethod: 'oidc',
@@ -391,6 +395,7 @@ export default function SetupWizard() {
             plexUrl={state.plexUrl}
             plexToken={state.plexToken}
             plexLibraryId={state.plexLibraryId}
+            plexTriggerScanAfterImport={state.plexTriggerScanAfterImport}
             onUpdate={updateField}
             onNext={() => goToStep(currentStepNumber + 1)}
             onBack={() => goToStep(currentStepNumber - 1)}
@@ -408,6 +413,7 @@ export default function SetupWizard() {
             absUrl={state.absUrl}
             absApiToken={state.absApiToken}
             absLibraryId={state.absLibraryId}
+            absTriggerScanAfterImport={state.absTriggerScanAfterImport}
             onUpdate={updateField}
             onNext={() => goToStep(currentStepNumber + 1)}
             onBack={() => goToStep(currentStepNumber - 1)}