feat(config): 添加环境变量加载功能

新增 LoadEnv 函数用于从 .env.local 文件加载环境变量
支持从多个路径查找配置文件

server/internal/config/config.go

@@ -101,3 +101,38 @@ func (d DB) DSN() string {
 	}
 	return d.User + ":" + d.Password + "@tcp(" + d.Host + ":" + d.Port + ")/" + d.Name + "?parseTime=True&loc=Local&charset=utf8mb4"
 }
+
+func LoadEnv() {
+	paths := []string{
+		".env.local",
+		filepath.Join("server", ".env.local"),
+	}
+	for _, p := range paths {
+		f, err := os.Open(p)
+		if err != nil {
+			continue
+		}
+		b, err := io.ReadAll(f)
+		f.Close()
+		if err != nil {
+			continue
+		}
+		lines := strings.Split(string(b), "\n")
+		for _, ln := range lines {
+			s := strings.TrimSpace(ln)
+			if s == "" || strings.HasPrefix(s, "#") {
+				continue
+			}
+			kv := strings.SplitN(s, "=", 2)
+			if len(kv) != 2 {
+				continue
+			}
+			k := strings.TrimSpace(kv[0])
+			v := strings.TrimSpace(kv[1])
+			if k != "" {
+				os.Setenv(k, v)
+			}
+		}
+		break
+	}
+}

server/log/server-20251127.log

@@ -138,3 +138,5 @@ server listening on  :8077
 {"bytes":2075,"duration_ms":44,"kind":"access","level":"INFO","method":"","path":"","query":"","remote":"","status":200,"trace_id":"","ts":"2025-11-27T18:38:02+08:00"}
 {"bytes":2075,"duration_ms":47,"kind":"access","level":"INFO","method":"","path":"","query":"","remote":"","status":200,"trace_id":"","ts":"2025-11-27T18:38:04+08:00"}
 {"bytes":2187,"duration_ms":92,"kind":"access","level":"INFO","method":"","path":"","query":"","remote":"","status":200,"trace_id":"","ts":"2025-11-27T18:38:10+08:00"}
+connecting YMT MySQL: 47.97.27.195:3306 db merketing user root
+connecting Marketing MySQL: 192.168.6.92:3306 db market user root