feat: Phase 6.1 收尾 — 目的路由接入所有AI组件

- Orchestrator 现在接受独立的 chatAdapter 和 intentAdapter
- BackgroundThinker 使用 deep_thinking purpose 适配器
- MemoryExtractor 使用 memory_extraction purpose 适配器
- Synthesizer 使用 chat purpose 适配器
- .env 回退时所有适配器共享同一 provider，完全向后兼容

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/ai-core/cmd/main.go

@@ -70,11 +70,22 @@ func main() {
 
 	// 创建 ModelSelector (优先使用 models.json，回退到 .env)
 	modelSelector := llm.NewModelSelector(configLoader, envFallback)
-	llmAdapter := modelSelector.DefaultAdapter()
+
+	// 为不同用途创建独立的适配器，支持目的路由
+	// 在 .env 回退模式下，所有适配器共享同一 provider
+	chatAdapter := modelSelector.DefaultAdapter()
+	provider, _ := modelSelector.Select(context.Background(), llm.PurposeIntentAnalysis)
+	intentAdapter := llm.NewAdapter(provider)
+	provider, _ = modelSelector.Select(context.Background(), llm.PurposeDeepThinking)
+	thinkerAdapter := llm.NewAdapter(provider)
+	provider, _ = modelSelector.Select(context.Background(), llm.PurposeMemoryExtraction)
+	memoryAdapter := llm.NewAdapter(provider)
+
 	if configLoader != nil && configLoader.HasConfig() {
-		log.Printf("LLM适配器已就绪: models.json 驱动")
+		log.Printf("LLM适配器已就绪: models.json 驱动 (chat=%s, intent=%s, think=%s, memory=%s)",
+			chatAdapter.ModelName(), intentAdapter.ModelName(), thinkerAdapter.ModelName(), memoryAdapter.ModelName())
 	} else {
-		log.Printf("LLM适配器已就绪: .env 驱动 (模型=%s)", llmAdapter.ModelName())
+		log.Printf("LLM适配器已就绪: .env 驱动 (模型=%s)", chatAdapter.ModelName())
 	}
 
 	// 初始化记忆系统
@@ -88,9 +99,9 @@ func main() {
 
 		memRetriever = memory.NewRetriever(memStore, nil)
 
-		// 记忆提取器使用LLM
+		// 记忆提取器使用 memory purpose 适配器
 		memExtractor = memory.NewExtractor(memStore, func(ctx context.Context, messages []model.LLMMessage) (*model.LLMResponse, error) {
-			return llmAdapter.Chat(ctx, messages)
+			return memoryAdapter.Chat(ctx, messages)
 		})
 		log.Println("记忆提取器已就绪")
 	}
@@ -150,7 +161,7 @@ func main() {
 		thinkerCfg,
 		personaLoader,
 		memRetriever,
-		llmAdapter,
+		thinkerAdapter,
 		iotClient,
 		memStore,
 		toolRegistry,
@@ -197,7 +208,7 @@ func main() {
 	mux := http.NewServeMux()
 
 	// 初始化子会话管理器
-	subManager := subsession.NewManager(llmAdapter)
+	subManager := subsession.NewManager(chatAdapter)
 
 	// 注册子会话提供者
 	subManager.Register(subsession.NewGeneralProvider(personaLoader))
@@ -210,11 +221,12 @@ func main() {
 	subManager.Register(subsession.NewReviewProvider())
 	log.Printf("子会话管理器已就绪: %d 个提供者 (%v)", len(subManager.ListProviders()), subManager.ListProviders())
 
-	// 构建新的 Orchestrator (v2.0)
+	// 构建新的 Orchestrator (v2.0) — 传入 purpose 专用适配器
 	orch := orchestrator.NewOrchestrator(
 		personaLoader,
 		ctxBuilder,
-		llmAdapter,
+		chatAdapter,
+		intentAdapter,
 		subManager,
 		memRetriever,
 		memExtractor,
@@ -224,7 +236,7 @@ func main() {
 
 	// 注册对话API端点
 	mux.HandleFunc("/api/v1/chat", func(w http.ResponseWriter, r *http.Request) {
-		handleChat(w, r, orch, ctxBuilder, llmAdapter, personaLoader, memRetriever, memExtractor, iotClient, thinker, toolRegistry)
+		handleChat(w, r, orch, ctxBuilder, personaLoader, memRetriever, memExtractor, iotClient, thinker, toolRegistry)
 	})
 
 	// 注册记忆API端点
@@ -262,7 +274,7 @@ func main() {
 
 	mux.HandleFunc("/api/v1/health", func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
-		w.Write([]byte(`{"status":"ok","service":"ai-core","model":"` + llmAdapter.ModelName() + `"}`))
+		w.Write([]byte(`{"status":"ok","service":"ai-core","model":"` + chatAdapter.ModelName() + `"}`))
 	})
 
 	// 启动HTTP服务
@@ -391,7 +403,6 @@ func handleChat(
 	r *http.Request,
 	orch *orchestrator.Orchestrator,
 	ctxBuilder *ctxbuild.Builder,
-	_ *llm.Adapter,
 	_ *persona.Loader,
 	_ *memory.Retriever,
 	_ *memory.Extractor,

backend/ai-core/internal/orchestrator/orchestrator.go

@@ -70,11 +70,13 @@ func (o *Orchestrator) getBus() bus.Bus {
 	return o.eventBus
 }
 
-// NewOrchestrator 创建编排器
+// NewOrchestrator 创建编排器。
+// chatAdapter 用于对话生成 (PurposeChat)，intentAdapter 用于意图分析 (PurposeIntentAnalysis)。
 func NewOrchestrator(
 	personaLoader *persona.Loader,
 	contextBuilder *ctxbuild.Builder,
-	llmAdapter *llm.Adapter,
+	chatAdapter *llm.Adapter,
+	intentAdapter *llm.Adapter,
 	subManager *subsession.Manager,
 	memoryRetriever *memory.Retriever,
 	memoryExtractor *memory.Extractor,
@@ -82,10 +84,10 @@ func NewOrchestrator(
 	return &Orchestrator{
 		personaLoader:   personaLoader,
 		contextBuilder:  contextBuilder,
-		llmAdapter:      llmAdapter,
+		llmAdapter:      chatAdapter,
 		subManager:      subManager,
-		intentAnalyzer:  NewIntentAnalyzer(llmAdapter),
-		synthesizer:     NewSynthesizer(llmAdapter),
+		intentAnalyzer:  NewIntentAnalyzer(intentAdapter),
+		synthesizer:     NewSynthesizer(chatAdapter),
 		memoryRetriever: memoryRetriever,
 		memoryExtractor: memoryExtractor,
 	}