feat(ai): unify reply center and refresh keyboard AI features

- Merge invitation, task, blessing, clarification, and empathy actions
  into a single Reply flow, with three fixed, clearly labeled stance
  choices whenever user intent must not be guessed.
- Refine clipboard semantic routing with bilingual schedule,
  confirmation, and follow-up models, conservative language thresholds,
  and explicit-assignment guard for complaint-only text.
- Persist Apple account refresh state, harden session recovery, and
  surface durable account diagnostics across keyboard and app.
- Derive personal-style prompts through two-stage corpus evidence and
  apply real low-confidence ASR tendencies instead of neutral templates.
- Localize the new reply center, clipboard semantics, and personal-style
  surfaces in both English and Simplified Chinese.

OSGKeyboardShared/Features/ManagedGateway/ManagedLLMClient.swift

@@ -26,6 +26,17 @@ public struct ManagedLLMClient: LLMClient {
             case .agent: .agentPlanning
             }
         }
+
+        static func resolve(taskKind: ManagedGatewayTaskKind?) -> Self {
+            switch taskKind {
+            case .dictationPolish, .translation, .editLastInput, nil:
+                return .polish
+            case .aiQuestion, .currentInformationQuestion, .clipboardTransform, .customSkill:
+                return .assistant
+            case .agentPlanning:
+                return .agent
+            }
+        }
     }
 
     private struct Attempt {