Add configurable file/dir perms and UMASK support

Introduce file and directory permission settings (fileChmod, dirChmod) end-to-end. UI: new controls in Paths settings with octal validation and defaults (664/775). API: GET exposes defaults; PUT validates octal strings and upserts configuration keys (file_chmod, dir_chmod) and clears related cache keys. Runtime: read config values in file utilities and services (FileOrganizer, direct-download, chapter-merger, epub-fixer) to apply mkdir modes and chmod files/dirs; FileOrganizer now accepts fileMode/dirMode and getFileOrganizer reads/parses DB settings. Docker: add UMASK option to docker-compose and propagate/apply UMASK in entrypoint/app-start scripts. Tests: update mocks to account for config service usage.

src/app/api/admin/settings/paths/route.ts

@@ -15,7 +15,7 @@ export async function PUT(request: NextRequest) {
   return requireAuth(request, async (req: AuthenticatedRequest) => {
     return requireAdmin(req, async () => {
       try {
-        const { downloadDir, mediaDir, audiobookPathTemplate, ebookPathTemplate, metadataTaggingEnabled, chapterMergingEnabled, fileRenameEnabled, fileRenameTemplate } = await request.json();
+        const { downloadDir, mediaDir, audiobookPathTemplate, ebookPathTemplate, metadataTaggingEnabled, chapterMergingEnabled, fileRenameEnabled, fileRenameTemplate, fileChmod, dirChmod } = await request.json();
 
         if (!downloadDir || !mediaDir) {
           return NextResponse.json(
@@ -32,6 +32,21 @@ export async function PUT(request: NextRequest) {
           );
         }
 
+        // Validate octal permission strings (3-4 digits, each 0-7)
+        const octalRegex = /^[0-7]{3,4}$/;
+        if (fileChmod !== undefined && !octalRegex.test(fileChmod)) {
+          return NextResponse.json(
+            { error: 'File permissions must be 3-4 octal digits (0-7), e.g. 664' },
+            { status: 400 }
+          );
+        }
+        if (dirChmod !== undefined && !octalRegex.test(dirChmod)) {
+          return NextResponse.json(
+            { error: 'Directory permissions must be 3-4 octal digits (0-7), e.g. 775' },
+            { status: 400 }
+          );
+        }
+
         // Update configuration
         await prisma.configuration.upsert({
           where: { key: 'download_dir' },
@@ -123,6 +138,34 @@ export async function PUT(request: NextRequest) {
           });
         }
 
+        // Update file permissions (octal chmod)
+        if (fileChmod !== undefined) {
+          await prisma.configuration.upsert({
+            where: { key: 'file_chmod' },
+            update: { value: fileChmod },
+            create: {
+              key: 'file_chmod',
+              value: fileChmod,
+              category: 'automation',
+              description: 'Octal permissions applied to organized files',
+            },
+          });
+        }
+
+        // Update directory permissions (octal chmod)
+        if (dirChmod !== undefined) {
+          await prisma.configuration.upsert({
+            where: { key: 'dir_chmod' },
+            update: { value: dirChmod },
+            create: {
+              key: 'dir_chmod',
+              value: dirChmod,
+              category: 'automation',
+              description: 'Octal permissions applied to created directories',
+            },
+          });
+        }
+
         logger.info('Paths settings updated');
 
         // Clear config cache for all updated keys so services get fresh values
@@ -135,6 +178,8 @@ export async function PUT(request: NextRequest) {
         configService.clearCache('chapter_merging_enabled');
         configService.clearCache('file_rename_enabled');
         configService.clearCache('file_rename_template');
+        configService.clearCache('file_chmod');
+        configService.clearCache('dir_chmod');
 
         // Invalidate all download client singletons to force reload of download_dir
         const { invalidateDownloadClientManager } = await import('@/lib/services/download-client-manager.service');

src/app/api/admin/settings/route.ts

@@ -130,6 +130,8 @@ export async function GET(request: NextRequest) {
         chapterMergingEnabled: configMap.get('chapter_merging_enabled') === 'true',
         fileRenameEnabled: configMap.get('file_rename_enabled') === 'true',
         fileRenameTemplate: configMap.get('file_rename_template') || '{title}',
+        fileChmod: configMap.get('file_chmod') || '664',
+        dirChmod: configMap.get('dir_chmod') || '775',
       },
       ebook: {
         // New granular source toggles (with migration from legacy ebook_sidecar_enabled)