merge: usage 用量 + 广告解锁 [tsk_1taxhtV2k3RP]

# Conflicts:
#	server/internal/apierr/apierr.go

server/internal/apierr/apierr.go

@@ -108,6 +108,29 @@ var (
 
 // Webhook-specific errors.
 var (
+	// Usage / ads / quota errors.
+	ErrAdNotUnlocked = &Error{
+		Code:      "AD_NOT_UNLOCKED",
+		MessageZH: "请先观看激励视频解锁当日时长",
+		MessageEn: "Please watch the rewarded ad to unlock today's minutes",
+	}
+	ErrQuotaExhausted = &Error{
+		Code:      "QUOTA_EXHAUSTED",
+		MessageZH: "今日免费时长已用尽，请明天再来或升级套餐",
+		MessageEn: "Today's free minutes are used up, try tomorrow or upgrade",
+	}
+	ErrAdVerifyFailed = &Error{
+		Code:      "AD_VERIFY_FAILED",
+		MessageZH: "广告回执校验失败",
+		MessageEn: "Ad receipt verification failed",
+	}
+	ErrAdReplay = &Error{
+		Code:      "AD_TOKEN_REPLAY",
+		MessageZH: "该广告回执已被使用",
+		MessageEn: "This ad receipt has already been used",
+	}
+
+	// Webhook-specific errors.
 	ErrWebhookSignature = &Error{
 		Code:      "WEBHOOK_INVALID_SIGNATURE",
 		MessageZH: "签名校验失败",