feat: 算力引擎 Go 后端核心（new-api）

- 统一 OpenAI 兼容 /v1 中继 + 渠道/额度/令牌/流水
- 各领域包：relay 模型网关、model 数据层、controller 管理 API

constant/task.go

@@ -0,0 +1,24 @@
+package constant
+
+type TaskPlatform string
+
+const (
+	TaskPlatformSuno       TaskPlatform = "suno"
+	TaskPlatformMidjourney              = "mj"
+)
+
+const (
+	SunoActionMusic  = "MUSIC"
+	SunoActionLyrics = "LYRICS"
+
+	TaskActionGenerate          = "generate"
+	TaskActionTextGenerate      = "textGenerate"
+	TaskActionFirstTailGenerate = "firstTailGenerate"
+	TaskActionReferenceGenerate = "referenceGenerate"
+	TaskActionRemix             = "remixGenerate"
+)
+
+var SunoModel2Action = map[string]string{
+	"suno_music":  SunoActionMusic,
+	"suno_lyrics": SunoActionLyrics,
+}