feat(Sora): 完成Sora网关接入与媒体能力

新增 Sora 网关路由、账号调度与同步服务\n补充媒体代理与签名 URL、模型列表动态拉取\n完善计费配置、前端支持与相关测试

backend/internal/handler/admin/model_handler.go

@@ -0,0 +1,55 @@
+package admin
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+// ModelHandler handles admin model listing requests.
+type ModelHandler struct {
+	sora2apiService *service.Sora2APIService
+}
+
+// NewModelHandler creates a new ModelHandler.
+func NewModelHandler(sora2apiService *service.Sora2APIService) *ModelHandler {
+	return &ModelHandler{
+		sora2apiService: sora2apiService,
+	}
+}
+
+// List handles listing models for a specific platform
+// GET /api/v1/admin/models?platform=sora
+func (h *ModelHandler) List(c *gin.Context) {
+	platform := strings.TrimSpace(strings.ToLower(c.Query("platform")))
+	if platform == "" {
+		response.BadRequest(c, "platform is required")
+		return
+	}
+
+	switch platform {
+	case service.PlatformSora:
+		if h.sora2apiService == nil || !h.sora2apiService.Enabled() {
+			response.Error(c, http.StatusServiceUnavailable, "sora2api not configured")
+			return
+		}
+		models, err := h.sora2apiService.ListModels(c.Request.Context())
+		if err != nil {
+			response.Error(c, http.StatusServiceUnavailable, "failed to fetch sora models")
+			return
+		}
+		ids := make([]string, 0, len(models))
+		for _, m := range models {
+			if strings.TrimSpace(m.ID) != "" {
+				ids = append(ids, m.ID)
+			}
+		}
+		response.Success(c, ids)
+	default:
+		response.BadRequest(c, "unsupported platform")
+	}
+}