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/Utilities/ExtL10n.swift

@@ -6,8 +6,8 @@
 // duplicate Localizable.strings variant groups into the main app target only.
 
 import Foundation
-import SwiftUI
 import OSGKeyboardShared
+import SwiftUI
 
 enum ExtL10n {
     private static let table = "Keyboard"

OSGKeyboardExt/Utilities/KeyboardHapticFeedback.swift

@@ -4,8 +4,8 @@
 // Role-based typing haptics (no screen-position mapping). Intensity comes
 // from Settings → General → Haptics (off / light / strong).
 
-import UIKit
 import OSGKeyboardShared
+import UIKit
 
 /// Key roles drive distinct Taptic styles — closer to a real keyboard than
 /// a single buzz for every tap.

OSGKeyboardExt/Utilities/KeyboardSoundFeedback.swift

@@ -4,8 +4,8 @@
 // Plays the built-in iOS keyboard click sounds so the custom bottom-row
 // keys (space / return / delete) sound identical to the stock keyboard.
 
-import UIKit
 import AudioToolbox
+import UIKit
 
 /// 让键盘扩展支持系统点击音。`UIDevice.playInputClick()` 只有在「某个
 /// 可见的输入视图遵循本协议且返回 true」时才会发声。键盘扩展的根视图