feat(lyra)!: 添加结构化日志与请求追踪

- 配置 slog JSON 输出和日志级别
- 添加请求 ID、访问日志及上下文日志工具
- 拆分启动初始化并统一启动失败处理

BREAKING CHANGE: 配置文件必须提供 log.level，缺失或非法将导致启动失败

go/projects/lyra/internal/config/config.go

@@ -8,6 +8,7 @@ import (
 
 type Config struct {
 	App      AppConfig      `mapstructure:"app"`
+	Log      LogConfig      `mapstructure:"log"`
 	HTTP     HTTPConfig     `mapstructure:"http"`
 	Database DatabaseConfig `mapstructure:"database"`
 	Cache    CacheConfig    `mapstructure:"cache"`
@@ -18,6 +19,9 @@ type AppConfig struct {
 	Env  string `mapstructure:"env"`
 }
 
+type LogConfig struct {
+	Level string `mapstructure:"level"`
+}
 type HTTPConfig struct {
 	Host string `mapstructure:"host"`
 	Port int    `mapstructure:"port"`