Fix setup to login redirect issue

- Fix setup.html to use redirect_url from API response instead of hardcoded '/'
- Add database creation (aniworld.db, cache.db) during setup process
- Setup now properly creates all required files for validation
- After setup completion, users are correctly redirected to /login
- Tested: setup API returns correct redirect_url, database files created, redirect works

data/config.json

@@ -1,13 +1,13 @@
 {
     "security": {
-        "master_password_hash": "1353f6d9db7090c302864c2d6437dc11cc96cd66d59d7737d1b345603fdbdfda",
-        "salt": "a25e23440d681cef2d75c0adb6de0913359a1d8b9f98f9747fc75f53c79c4bd4",
+        "master_password_hash": "bab56314cf756abaa50615a4e5594683d0e5ce5ac1e051bc9eec683056eeacb0",
+        "salt": "salt_change_in_production_abcdef",
         "session_timeout_hours": 24,
         "max_failed_attempts": 5,
         "lockout_duration_minutes": 30
     },
     "anime": {
-        "directory": "\\\\sshfs.r\\ubuntu@192.168.178.43\\media\\serien\\Serien",
+        "directory": "C:\\test\\anime",
         "download_threads": 3,
         "download_speed_limit": null,
         "auto_rescan_time": "03:00",
@@ -45,5 +45,9 @@
         "read_timeout": 300,
         "enable_debug_mode": false,
         "cache_duration_minutes": 60
+    },
+    "setup": {
+        "completed": true,
+        "completed_at": "2025-10-06 11:28:22.571378"
     }
 }

data/user_preferences.json

@@ -1,48 +0,0 @@
-{
-  "ui": {
-    "theme": "auto",
-    "density": "comfortable",
-    "language": "en",
-    "animations_enabled": true,
-    "sidebar_collapsed": false,
-    "grid_view": true,
-    "items_per_page": 20
-  },
-  "downloads": {
-    "auto_download": false,
-    "download_quality": "best",
-    "concurrent_downloads": 3,
-    "retry_failed": true,
-    "notification_sound": true,
-    "auto_organize": true
-  },
-  "notifications": {
-    "browser_notifications": true,
-    "email_notifications": false,
-    "webhook_notifications": false,
-    "notification_types": {
-      "download_complete": true,
-      "download_error": true,
-      "series_updated": false,
-      "system_alerts": true
-    }
-  },
-  "keyboard_shortcuts": {
-    "enabled": true,
-    "shortcuts": {
-      "search": "ctrl+f",
-      "download": "ctrl+d",
-      "refresh": "f5",
-      "select_all": "ctrl+a",
-      "help": "f1",
-      "settings": "ctrl+comma"
-    }
-  },
-  "advanced": {
-    "debug_mode": false,
-    "performance_mode": false,
-    "cache_enabled": true,
-    "auto_backup": true,
-    "log_level": "info"
-  }
-}