Restructure model

Model/Applications/VideosApp.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+enum VideosApp: String, CaseIterable {
+    case invidious, piped
+
+    var name: String {
+        rawValue.capitalized
+    }
+
+    var supportsAccounts: Bool {
+        self == .invidious
+    }
+
+    var supportsPopular: Bool {
+        self == .invidious
+    }
+
+    var supportsSearchFilters: Bool {
+        self == .invidious
+    }
+
+    var supportsSubscriptions: Bool {
+        supportsAccounts
+    }
+
+    var supportsTrendingCategories: Bool {
+        self == .invidious
+    }
+
+    var supportsUserPlaylists: Bool {
+        self == .invidious
+    }
+}