feat(lyra)!: 接入 Redis 并添加缓存连通性实验

- 封装缓存读写、JSON 编解码、过期时间与操作超时
- 集中组装 Redis 依赖，在测试接口验证分类缓存读写
- 更新依赖并移除原 handler 测试

BREAKING CHANGE: 配置节由 redis 改为 cache，新增 db 和 timeout 配置项

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

@@ -10,7 +10,7 @@ type Config struct {
 	App      AppConfig      `mapstructure:"app"`
 	HTTP     HTTPConfig     `mapstructure:"http"`
 	Database DatabaseConfig `mapstructure:"database"`
-	Redis    RedisConfig    `mapstructure:"redis"`
+	Cache    CacheConfig    `mapstructure:"cache"`
 }
 
 type AppConfig struct {
@@ -32,9 +32,11 @@ type DatabaseConfig struct {
 	Password string `mapstructure:"password"`
 }
 
-type RedisConfig struct {
-	Host string `mapstructure:"host"`
-	Port int    `mapstructure:"port"`
+type CacheConfig struct {
+	Host    string `mapstructure:"host"`
+	Port    int    `mapstructure:"port"`
+	DB      int    `mapstructure:"db"`
+	Timeout int    `mapstructure:"timeout"`
 }
 
 func Load(path string) (*Config, error) {