feat(storage): add Apple iCloud Drive storage provider

Add iCloud Drive as a new storage destination using the pyicloud library.
Includes upload task, configuration, user integration handler, provider
status, onboarding support, and comprehensive tests.

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

app/utils/config_validator/providers.py

@@ -373,4 +373,19 @@ def get_provider_status() -> dict[str, dict[str, object]]:
         },
     }
 
+    # Check iCloud Drive configuration
+    providers["iCloud Drive"] = {
+        "name": "iCloud Drive",
+        "icon": "fa-brands fa-apple",
+        "configured": bool(getattr(settings, "icloud_username", None) and getattr(settings, "icloud_password", None)),
+        "enabled": True,
+        "description": "Store documents in Apple iCloud Drive",
+        "details": {
+            "username": getattr(settings, "icloud_username", "Not set"),
+            "password": mask_sensitive_value(getattr(settings, "icloud_password", None)),
+            "folder": getattr(settings, "icloud_folder", "Not set"),
+            "cookie_directory": getattr(settings, "icloud_cookie_directory", "Not set"),
+        },
+    }
+
     return providers

app/utils/settings_service.py

@@ -838,6 +838,39 @@ SETTING_METADATA = {
         "required": False,
         "restart_required": False,
     },
+    # Storage Providers - iCloud Drive
+    "icloud_username": {
+        "category": "Storage Providers",
+        "description": "Apple ID email address for iCloud Drive authentication",
+        "type": "string",
+        "sensitive": False,
+        "required": False,
+        "restart_required": False,
+    },
+    "icloud_password": {
+        "category": "Storage Providers",
+        "description": "App-specific password for iCloud Drive (generate at https://appleid.apple.com)",
+        "type": "string",
+        "sensitive": True,
+        "required": False,
+        "restart_required": False,
+    },
+    "icloud_folder": {
+        "category": "Storage Providers",
+        "description": "Target folder path in iCloud Drive (e.g. Documents/Uploads)",
+        "type": "string",
+        "sensitive": False,
+        "required": False,
+        "restart_required": False,
+    },
+    "icloud_cookie_directory": {
+        "category": "Storage Providers",
+        "description": "Directory for persisting iCloud session cookies (default: ~/.pyicloud)",
+        "type": "string",
+        "sensitive": False,
+        "required": False,
+        "restart_required": False,
+    },
     # Storage Providers - AWS S3
     "aws_access_key_id": {
         "category": "Storage Providers",