feat: Round 5 - Memory Service, Tool Engine, Call Records, Thinking Logs

- Fix: Session history flash (race condition + WS guard)
- Fix: Chat background overlay + sidebar transparency
- Fix: IoT device control (Chinese action names, status field)
- Feat: Independent memory-service (port 8091, 13 endpoints)
- Feat: Independent tool-engine service (port 8092, 13 tools)
- Feat: Tool call logs with paginated DevTools panel
- Feat: Thinking log records with DevTools panel
- Feat: Future development roadmap document
- Chore: Updated .gitignore, go.work, DevTools config
- Chore: 5-service health check, project review docs

backend/gateway/internal/config/config.go

@@ -39,9 +39,15 @@ type Config struct {
 	// AI-Core 服务
 	AICoreURL string
 
+	// Memory 服务
+	MemoryServiceURL string
+
 	// IoT 调试服务
 	IoTDebugServiceURL string
 
+	// Tool-Engine 工具引擎服务
+	ToolEngineURL string
+
 	// LLM (透传给AI-Core，Gateway可能也需要)
 	LLMAPIURL  string
 	LLMAPIKey  string
@@ -85,8 +91,12 @@ func Load() *Config {
 
 		AICoreURL: getEnv("AI_CORE_URL", "http://localhost:8081"),
 
+		MemoryServiceURL: getEnv("MEMORY_SERVICE_URL", "http://localhost:8091"),
+
 		IoTDebugServiceURL: getEnv("IOT_DEBUG_SERVICE_URL", "http://localhost:8083"),
 
+		ToolEngineURL: getEnv("TOOL_ENGINE_URL", "http://localhost:8092"),
+
 		LLMAPIURL: getEnv("LLM_API_URL", "https://api.openai.com/v1"),
 		LLMAPIKey: getEnv("LLM_API_KEY", ""),
 		LLMModel:  getEnv("LLM_MODEL", "gpt-4o"),