feat(account): add managed credits and cloud gateway

Introduce optional Apple account-backed credits with scoped gateway access while preserving local and BYOK paths. Refresh assistant behavior, tests, privacy disclosures, docs, and the website for the 2.0 experience.

OSGKeyboardExt/KeyboardViewController.swift

@@ -14,10 +14,10 @@
 //   • `phase` is a real stored property (no derivation) — the previous
 //     "derive from recordStream" shim locked out every press after the first.
 
-import UIKit
-import SwiftUI
 import Combine
 import OSGKeyboardShared
+import SwiftUI
+import UIKit
 
 private final class KeyboardHostingController: UIHostingController<KeyboardSurfaceRoot> {
     override var preferredScreenEdgesDeferringSystemGestures: UIRectEdge {
@@ -994,7 +994,7 @@ public final class KeyboardViewController: UIInputViewController {
             host.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
             host.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
             host.view.topAnchor.constraint(equalTo: view.topAnchor),
-            host.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
+            host.view.bottomAnchor.constraint(equalTo: view.bottomAnchor)
         ])
         host.didMove(toParent: self)
         hosting = host