feat: support SiliconFlow (close #437, close #403)

relay/channel/siliconflow/dto.go

@@ -0,0 +1,17 @@
+package siliconflow
+
+import "one-api/dto"
+
+type SFTokens struct {
+	InputTokens  int `json:"input_tokens"`
+	OutputTokens int `json:"output_tokens"`
+}
+
+type SFMeta struct {
+	Tokens SFTokens `json:"tokens"`
+}
+
+type SFRerankResponse struct {
+	Results []dto.RerankResponseDocument `json:"results"`
+	Meta    SFMeta                       `json:"meta"`
+}