feat: 新增Model管理模块

- 添加 Model 实体定义
- 实现 Model CRUD 接口
- 添加 Model 仓储层和服务层

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/internal/handler/model_handler.go

@@ -0,0 +1,108 @@
+package handler
+
+import (
+	"net/http"
+	"x-agents/server/internal/model"
+	"x-agents/server/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+// ModelHandler 模型处理器
+type ModelHandler struct {
+	service *service.ModelService
+}
+
+func NewModelHandler(svc *service.ModelService) *ModelHandler {
+	return &ModelHandler{service: svc}
+}
+
+// List 获取列表
+func (h *ModelHandler) List(c *gin.Context) {
+	list, err := h.service.List()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	if list == nil {
+		list = []model.ModelInfo{}
+	}
+
+	c.JSON(http.StatusOK, gin.H{"list": list})
+}
+
+// GetByID 获取详情
+func (h *ModelHandler) GetByID(c *gin.Context) {
+	id := c.Param("id")
+	model, err := h.service.GetByID(id)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Model not found"})
+		return
+	}
+	c.JSON(http.StatusOK, model)
+}
+
+// Create 创建
+func (h *ModelHandler) Create(c *gin.Context) {
+	var req model.CreateModelRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	result, err := h.service.Create(req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}
+
+// Update 更新
+func (h *ModelHandler) Update(c *gin.Context) {
+	id := c.Param("id")
+	var req model.UpdateModelRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	result, err := h.service.Update(id, req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}
+
+// Delete 删除
+func (h *ModelHandler) Delete(c *gin.Context) {
+	id := c.Param("id")
+	err := h.service.Delete(id)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"success": true})
+}
+
+// Test 测试连接
+func (h *ModelHandler) Test(c *gin.Context) {
+	var req model.TestModelRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	result, err := h.service.TestConnection(req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}