更新环境配置，优化数据库和Redis连接设置

- 修改`.env.example`文件，更新数据库和Redis的默认主机地址为`192.168.9.127`
- 在`docker-compose.yml`中移除不必要的卷挂载配置
- 在`go.mod`中添加`github.com/joho/godotenv`依赖以支持环境变量加载
- 更新`README.md`以反映新的数据库和Redis连接信息
- 在`main.go`中加载环境变量以支持动态配置
- 新增缓存存在性检查功能，避免重复预热缓存
- 优化CSV读取逻辑，支持从S3获取数据

internal/config/equalize.go

@@ -3,32 +3,18 @@ package config
 import "os"
 
 type EqualizeConfig struct {
-	APIURL              string
-	MeasurementBasePath string
-	TargetBasePath      string
+	APIURL string
 }
 
 func loadEqualize(env string) EqualizeConfig {
 	if os.Getenv("EQ_API_URL") != "" {
-		return EqualizeConfig{
-			APIURL:              os.Getenv("EQ_API_URL"),
-			MeasurementBasePath: getEnv("MEASUREMENT_BASE_PATH", "/app/measurements"),
-			TargetBasePath:      getEnv("TARGET_BASE_PATH", "/app/targets"),
-		}
+		return EqualizeConfig{APIURL: os.Getenv("EQ_API_URL")}
 	}
 
 	switch env {
 	case "production":
-		return EqualizeConfig{
-			APIURL:              "http://172.31.18.70:8000/equalize",
-			MeasurementBasePath: getEnv("MEASUREMENT_BASE_PATH", "/app/measurements"),
-			TargetBasePath:      getEnv("TARGET_BASE_PATH", "/app/targets"),
-		}
+		return EqualizeConfig{APIURL: "http://172.31.18.70:8000/equalize"}
 	default:
-		return EqualizeConfig{
-			APIURL:              "https://autoeq.app/equalize",
-			MeasurementBasePath: getEnv("MEASUREMENT_BASE_PATH", "/app/measurements"),
-			TargetBasePath:      getEnv("TARGET_BASE_PATH", "/app/targets"),
-		}
+		return EqualizeConfig{APIURL: "https://autoeq.app/equalize"}
 	}
 }