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

relaykit/relayconvert/reasoning/suffix.go

@@ -0,0 +1,51 @@
+package reasoning
+
+import (
+	"strings"
+
+	"github.com/samber/lo"
+)
+
+var EffortSuffixes = []string{"-max", "-xhigh", "-high", "-medium", "-low", "-minimal"}
+
+var OpenAIEffortSuffixes = []string{"-high", "-minimal", "-low", "-medium", "-none", "-xhigh"}
+
+var DeepSeekV4EffortSuffixes = []string{"-none", "-max"}
+
+// TrimEffortSuffix -> modelName level(low) exists
+func TrimEffortSuffix(modelName string) (string, string, bool) {
+	return TrimEffortSuffixWithSuffixes(modelName, EffortSuffixes)
+}
+
+func TrimEffortSuffixWithSuffixes(modelName string, suffixes []string) (string, string, bool) {
+	suffix, found := lo.Find(suffixes, func(s string) bool {
+		return strings.HasSuffix(modelName, s)
+	})
+	if !found {
+		return modelName, "", false
+	}
+	return strings.TrimSuffix(modelName, suffix), strings.TrimPrefix(suffix, "-"), true
+}
+
+func ParseOpenAIReasoningEffortFromModelSuffix(modelName string) (string, string) {
+	baseModel, effort, ok := TrimEffortSuffixWithSuffixes(modelName, OpenAIEffortSuffixes)
+	if !ok {
+		return "", modelName
+	}
+	return effort, baseModel
+}
+
+func ParseDeepSeekV4ThinkingSuffix(modelName string) (baseModel string, thinkingType string, effort string, ok bool) {
+	baseModel, suffix, ok := TrimEffortSuffixWithSuffixes(modelName, DeepSeekV4EffortSuffixes)
+	if !ok || !strings.HasPrefix(baseModel, "deepseek-v4-") {
+		return modelName, "", "", false
+	}
+	switch suffix {
+	case "none":
+		return baseModel, "disabled", "", true
+	case "max":
+		return baseModel, "enabled", "max", true
+	default:
+		return modelName, "", "", false
+	}
+}