新增客户端管理功能，包括创建、编辑和删除客户端的API，更新用户管理功能，添加用户创建和编辑页面，优化管理员功能，增强用户和客户端的管理体验。

handlers/client_handler.go

@@ -0,0 +1,75 @@
+package handlers
+
+import (
+	"net/http"
+
+	"oidc-oauth2-server/services"
+
+	"github.com/gin-gonic/gin"
+)
+
+type ClientHandler struct {
+	clientService *services.ClientService
+}
+
+func NewClientHandler(clientService *services.ClientService) *ClientHandler {
+	return &ClientHandler{clientService: clientService}
+}
+
+// RegisterRoutes 注册路由
+func (h *ClientHandler) RegisterRoutes(router *gin.Engine) {
+	api := router.Group("/api")
+	{
+		api.POST("/clients", h.CreateClient)
+		api.PUT("/clients/:id", h.UpdateClient)
+		api.DELETE("/clients/:id", h.DeleteClient)
+	}
+}
+
+// CreateClient 创建客户端
+func (h *ClientHandler) CreateClient(c *gin.Context) {
+	var req services.ClientRegistrationRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	client, err := h.clientService.RegisterClient(&req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusCreated, client)
+}
+
+// UpdateClient 更新客户端
+func (h *ClientHandler) UpdateClient(c *gin.Context) {
+	clientID := c.Param("id")
+
+	var req services.ClientRegistrationRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	client, err := h.clientService.UpdateClient(clientID, &req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusOK, client)
+}
+
+// DeleteClient 删除客户端
+func (h *ClientHandler) DeleteClient(c *gin.Context) {
+	clientID := c.Param("id")
+
+	if err := h.clientService.DeleteClient(clientID); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	c.Status(http.StatusOK)
+}