Remote sync of webdav

lib/services/cloud_oauth_config.dart

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+/// Fill these in once the corresponding OAuth apps/registrations exist —
+/// see README.md "Manual setup required" for exact steps per provider.
+class CloudOAuthConfig {
+  // --- Google Drive ---
+  //
+  // - Android sign-in (Credential Manager-based, as of google_sign_in v7)
+  //   authenticates using a *Web application* type OAuth client's ID, not
+  //   the Android client's own ID. The separate Android OAuth client
+  //   (registered with the package name + debug/release SHA-1) is still
+  //   required, but only to let Credential Manager verify this specific
+  //   signed app — its client ID itself is never referenced here.
+  // - iOS uses its own iOS-type OAuth client ID directly.
+
+  /// The Web application OAuth client ID. Required for sign-in to work on
+  /// Android.
+  static const String? googleAndroidServerClientId = null; // TODO: fill in
+
+  /// The iOS OAuth client ID. Leave null if GIDClientID is instead set
+  /// directly in ios/Runner/Info.plist.
+  static const String? googleIosClientId = null; // TODO: fill in
+
+  // --- Dropbox ---
+  //
+  // From a "Full Dropbox" access app at dropbox.com/developers/apps.
+
+  /// The app's key (client ID for OAuth2 PKCE — no secret needed).
+  static const String? dropboxAppKey = null; // TODO: fill in
+
+  /// Custom URL scheme redirect registered in the Dropbox app console.
+  /// The scheme "mofueltaxback-dropbox" is already wired up in
+  /// AndroidManifest.xml / Info.plist, so unless you have a reason to pick
+  /// a different scheme, use exactly:
+  /// "mofueltaxback-dropbox://oauth2redirect"
+  static const String? dropboxRedirectUri = null; // TODO: fill in
+
+  // --- OneDrive (Microsoft Graph) ---
+  //
+  // From an app registration in Azure Portal → Entra ID → App
+  // registrations, with Graph delegated permissions Files.ReadWrite.All +
+  // offline_access, redirect URI registered as a "Mobile and desktop
+  // application" platform.
+
+  /// The Application (client) ID from the Azure app registration.
+  static const String? oneDriveClientId = null; // TODO: fill in
+
+  /// Custom URL scheme redirect registered in Azure. The scheme
+  /// "mofueltaxback-onedrive" is already wired up in AndroidManifest.xml /
+  /// Info.plist, so unless you have a reason to pick a different scheme,
+  /// register and use exactly:
+  /// "mofueltaxback-onedrive://auth"
+  static const String? oneDriveRedirectUri = null; // TODO: fill in
+}