Enhanced setup and settings pages with full configuration

- Extended SetupRequest model to include all configuration fields
- Updated setup API endpoint to handle comprehensive configuration
- Created new setup.html with organized configuration sections
- Enhanced config modal in index.html with all settings
- Updated JavaScript modules to use unified config API
- Added backup configuration section
- Documented new features in features.md and instructions.md

src/server/web/static/js/index/nfo-config.js

@@ -92,8 +92,16 @@ AniWorld.NFOConfig = (function() {
                 return;
             }
             
-            const nfoConfig = {
-                tmdb_api_key: tmdbKey ? tmdbKey.value.trim() : null,
+            // Get current config
+            const configResponse = await AniWorld.ApiClient.get(AniWorld.Constants.API.CONFIG);
+            if (!configResponse) {
+                throw new Error('Failed to load current configuration');
+            }
+            const config = await configResponse.json();
+            
+            // Update NFO settings
+            config.nfo = {
+                tmdb_api_key: tmdbKey ? tmdbKey.value.trim() || null : null,
                 auto_create: autoCreate ? autoCreate.checked : false,
                 update_on_scan: updateOnScan ? updateOnScan.checked : false,
                 download_poster: downloadPoster ? downloadPoster.checked : true,
@@ -103,13 +111,7 @@ AniWorld.NFOConfig = (function() {
             };
             
             // Save configuration
-            const response = await AniWorld.ApiClient.request(
-                API.CONFIG,
-                {
-                    method: 'PUT',
-                    body: JSON.stringify({ nfo: nfoConfig })
-                }
-            );
+            const response = await AniWorld.ApiClient.put(AniWorld.Constants.API.CONFIG, config);
             
             if (response) {
                 AniWorld.UI.showToast('NFO configuration saved successfully', 'success');