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.

OSGKeyboardShared/Models/FlowUtteranceRequest.swift

@@ -13,6 +13,8 @@ public struct FlowUtteranceRequest: Equatable, Sendable {
     public let aiConversationID: UUID?
     /// When set with `.aiQuestion`, host skips ASR and answers this text.
     public let aiQuestionText: String?
+    /// Fine-grained managed-gateway intent. Regular questions keep the default.
+    public let aiTaskKind: ManagedGatewayTaskKind?
     /// Clipboard-skill thinking override. Nil keeps AI-mode default (on).
     public let aiThinkingEnabled: Bool?
 
@@ -25,6 +27,7 @@ public struct FlowUtteranceRequest: Equatable, Sendable {
         sourceHistoryEntryRevision: Int64? = nil,
         aiConversationID: UUID? = nil,
         aiQuestionText: String? = nil,
+        aiTaskKind: ManagedGatewayTaskKind? = nil,
         aiThinkingEnabled: Bool? = nil
     ) {
         self.mode = mode
@@ -33,6 +36,7 @@ public struct FlowUtteranceRequest: Equatable, Sendable {
         self.sourceHistoryEntryRevision = sourceHistoryEntryRevision
         self.aiConversationID = aiConversationID
         self.aiQuestionText = aiQuestionText
+        self.aiTaskKind = aiTaskKind
         self.aiThinkingEnabled = aiThinkingEnabled
     }
 
@@ -53,12 +57,14 @@ public struct FlowUtteranceRequest: Equatable, Sendable {
     public static func aiQuestion(
         conversationID: UUID,
         prefilledQuestion: String? = nil,
+        taskKind: ManagedGatewayTaskKind = .aiQuestion,
         thinkingEnabled: Bool? = nil
     ) -> FlowUtteranceRequest {
         FlowUtteranceRequest(
             mode: .aiQuestion,
             aiConversationID: conversationID,
             aiQuestionText: prefilledQuestion,
+            aiTaskKind: taskKind,
             aiThinkingEnabled: thinkingEnabled
         )
     }