fix(phase24): 首席架構師 Review C1/C2/C3/I4 修復

C1 (P0): AIRouterExecutor.execute() 補 Langfuse Trace (D5)
  - 建立 langfuse_trace("ai_router_execute") 包住整個執行鏈
  - 成功時記錄 generation (model/input/output/tokens/cost)
  - prod 所有 AI 呼叫現在有 LLMOps 追蹤

C2 (P0): 絞殺者改為呼叫 AIRouter.route() 智慧路由
  - 先取得 RoutingDecision (意圖分類 + 複雜度評分)
  - provider_order 從 selected_provider + fallback_chain 動態生成
  - D1 意圖路由矩陣、D7 隱私保護 (DIAGNOSE 強制 local) 生效

C3 (P1): 型別標注 typo 修復
  - AIProviderEnumEnum → AIProviderEnum
  - AIProviderEnumProtocol → AIProviderProtocol

I4 (P1): interfaces.py AIProvider Protocol 補 close() 定義

S1: ai_router.py 模組版本標頭更新至 v4.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/openclaw.py

@@ -917,19 +917,38 @@ class OpenClawService:
         # =================================================================
         if settings.USE_AI_ROUTER:
             try:
-                from src.services.ai_router import get_ai_executor
+                # 2026-04-02 ogt: C2 修復 — 呼叫 AIRouter.route() 智慧路由 (非靜態 order)
+                # D1 意圖分類路由、D7 隱私保護 (DIAGNOSE/CODE_REVIEW 強制 local) 生效
+                from src.services.ai_router import get_ai_router, get_ai_executor, IntentType
+                router = get_ai_router()
                 executor = get_ai_executor()
+
+                # Step 1: 取得路由決策 (含意圖分類 + 複雜度評分)
+                decision = await router.route(prompt, alert_context)
+
+                # Step 2: 從 RoutingDecision 建立 provider_order (主 + fallback)
+                provider_order = [decision.selected_provider.value] + [
+                    p.value for p, _ in decision.fallback_chain
+                    if p.value != decision.selected_provider.value
+                ]
+
+                # Step 3: D7 隱私 — DIAGNOSE/CODE_REVIEW 強制 local
+                require_local = decision.intent in (IntentType.DIAGNOSE, IntentType.CODE_REVIEW)
+
                 result = await executor.execute(
                     prompt=prompt,
-                    provider_order=settings.AI_FALLBACK_ORDER,
+                    provider_order=provider_order,
                     context=alert_context,
                     cache_ttl=3600,
+                    require_local=require_local,
                 )
                 logger.info(
                     "phase24_ai_router_used",
                     provider=result.provider,
                     success=result.success,
                     latency_ms=round(result.latency_ms, 1),
+                    intent=decision.intent.value,
+                    routing_reason=decision.routing_reason,
                 )
                 return result.raw_response, result.provider, result.success, result.tokens, result.cost_usd
             except Exception as e: