feat: add logging and collector implementations

- Introduced `hertzx` package with `NewHertz` function for server initialization.
- Implemented `logx` package with various log collectors: Console, Loki, Elasticsearch, and Prometheus.
- Added `Logger` struct to manage logging levels and collectors.
- Created environment variable loading functionality in `osx` package to support configuration.
- Enhanced logging capabilities with structured log entries and asynchronous collection.

dbx/init.go

@@ -0,0 +1,88 @@
+package dbx
+
+import (
+	"git.liteyuki.org/LiteyukiStudio/folium/osx"
+	"gorm.io/gorm"
+)
+
+type DBDriverType string
+
+const (
+	Postgres DBDriverType = "postgres"
+	MySQL    DBDriverType = "mysql"
+	SQLite   DBDriverType = "sqlite"
+)
+
+// DBConfig 持有数据库连接配置，可以部分填写，未填写的字段会从环境变量读取默认值
+type DBConfig struct {
+	Driver   DBDriverType
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Sslmode  string
+}
+
+// NewDBConfigFromEnv 从环境变量构造默认配置
+func NewDBConfigFromEnv() *DBConfig {
+	return &DBConfig{
+		Driver:   DBDriverType(osx.GetEnv("DB_DRIVER", string(Postgres))),
+		Host:     osx.GetEnv("DB_HOST", "localhost"),
+		Port:     osx.GetEnv("DB_PORT", "5432"),
+		User:     osx.GetEnv("DB_USER", "user"),
+		Password: osx.GetEnv("DB_PASSWORD", "password"),
+		Sslmode:  osx.GetEnv("DB_SSLMODE", "disable"),
+	}
+}
+
+// FillDefaultsFromEnv 对于为空的字段，用环境变量或默认值补全
+func (c *DBConfig) FillDefaultsFromEnv() {
+	if c == nil {
+		c = &DBConfig{}
+	}
+	if c.Driver == "" {
+		c.Driver = DBDriverType(osx.GetEnv("DB_DRIVER", string(Postgres)))
+	}
+	if c.Host == "" {
+		c.Host = osx.GetEnv("DB_HOST", "localhost")
+	}
+	if c.Port == "" {
+		c.Port = osx.GetEnv("DB_PORT", "5432")
+	}
+	if c.User == "" {
+		c.User = osx.GetEnv("DB_USER", "user")
+	}
+	if c.Password == "" {
+		c.Password = osx.GetEnv("DB_PASSWORD", "password")
+	}
+	if c.Sslmode == "" {
+		c.Sslmode = osx.GetEnv("DB_SSLMODE", "disable")
+	}
+}
+
+// GetDB 使用给定配置（或 DefaultDBConfig if nil）并返回对应的 *gorm.DB
+// 如果 dbName 为空则使用配置中的 Name 字段（仍会从环境变量补全）
+func GetDB(cfg *DBConfig, dbName string) *gorm.DB {
+	if cfg == nil {
+		cfg = NewDBConfigFromEnv()
+	}
+	cfg.FillDefaultsFromEnv()
+
+	if dbName == "" {
+		dbName = osx.GetEnv("DB_NAME", "database")
+		if dbName == "" {
+			panic("database name is not specified")
+		}
+	}
+
+	switch cfg.Driver {
+	case Postgres:
+		return GetPostgresDB(cfg, dbName)
+	case MySQL:
+		return GetMySQLDB(cfg, dbName)
+	case SQLite:
+		return GetSQLiteDB(cfg, dbName)
+	default:
+		panic("unsupported database driver: " + string(cfg.Driver))
+	}
+}