feat(data-ana): 完善学情诊断服务并添加ClickHouse降级模式

config.py ClickHouse连接改可选+加DEV_MODE/kafka_brokers

clickhouse_client.py 降级模式: host为空时返回None

main.py 端点先查ClickHouse降级返回骨架数据+新增errorbook

新增clickhouse-init.sql创建宽表和错题表

Gateway添加/analytics路由

services/api-gateway/internal/config/config.go

@@ -15,6 +15,7 @@ type Config struct {
 	TeacherBffURL     string
 	CoreEduServiceURL string
 	ContentServiceURL string
+	DataAnaServiceURL string
 	OTLPEndpoint      string
 	LogLevel          string
 	DevMode           bool
@@ -31,6 +32,7 @@ func Load() *Config {
 		TeacherBffURL:     getEnv("TEACHER_BFF_URL", "http://localhost:3003"),
 		CoreEduServiceURL: getEnv("CORE_EDU_SERVICE_URL", "http://localhost:3004"),
 		ContentServiceURL: getEnv("CONTENT_SERVICE_URL", "http://localhost:3005"),
+		DataAnaServiceURL: getEnv("DATA_ANA_SERVICE_URL", "http://localhost:3006"),
 		OTLPEndpoint:      getEnv("OTEL_EXPORTER_OTLP_ENDPOINT", "http://localhost:4318"),
 		LogLevel:          getEnv("LOG_LEVEL", "info"),
 		DevMode:           getEnvBool("DEV_MODE", false),

services/api-gateway/main.go

@@ -108,6 +108,15 @@ func main() {
 		api.Any("/knowledge-points/*path", contentHandler)
 		api.Any("/questions", contentHandler)
 		api.Any("/questions/*path", contentHandler)
+
+		// data-ana 服务路由（学情诊断/错题本）
+		dataAnaProxy, err := proxy.NewProxy(cfg.DataAnaServiceURL)
+		if err != nil {
+			log.Fatalf("failed to create data-ana proxy: %v", err)
+		}
+		dataAnaHandler := proxy.ProxyHandler(dataAnaProxy)
+		api.Any("/analytics", dataAnaHandler)
+		api.Any("/analytics/*path", dataAnaHandler)
 	}
 
 	srv := &http.Server{