更新依赖项，优化 OAuth2 服务，添加 PKCE 支持，增强 OIDC 处理器，新增客户端注册和令牌管理端点，改进数据库模型以支持新功能。

handlers/registration.go

@@ -0,0 +1,77 @@
+package handlers
+
+import (
+	"net/http"
+
+	"oidc-oauth2-server/services"
+
+	"github.com/gin-gonic/gin"
+)
+
+type RegistrationHandler struct {
+	clientService *services.ClientService
+}
+
+func NewRegistrationHandler(clientService *services.ClientService) *RegistrationHandler {
+	return &RegistrationHandler{
+		clientService: clientService,
+	}
+}
+
+// Register 处理动态客户端注册
+func (h *RegistrationHandler) Register(c *gin.Context) {
+	var req services.ClientRegistrationRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid_request", "error_description": err.Error()})
+		return
+	}
+
+	client, err := h.clientService.RegisterClient(&req)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid_request", "error_description": err.Error()})
+		return
+	}
+
+	c.JSON(http.StatusCreated, client)
+}
+
+// GetClient 获取客户端信息
+func (h *RegistrationHandler) GetClient(c *gin.Context) {
+	clientID := c.Param("client_id")
+	client, err := h.clientService.GetClient(clientID)
+	if err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "not_found"})
+		return
+	}
+
+	c.JSON(http.StatusOK, client)
+}
+
+// UpdateClient 更新客户端信息
+func (h *RegistrationHandler) UpdateClient(c *gin.Context) {
+	clientID := c.Param("client_id")
+	var req services.ClientRegistrationRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid_request"})
+		return
+	}
+
+	client, err := h.clientService.UpdateClient(clientID, &req)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid_request"})
+		return
+	}
+
+	c.JSON(http.StatusOK, client)
+}
+
+// DeleteClient 删除客户端
+func (h *RegistrationHandler) DeleteClient(c *gin.Context) {
+	clientID := c.Param("client_id")
+	if err := h.clientService.DeleteClient(clientID); err != nil {
+		c.JSON(http.StatusNotFound, gin.H{"error": "not_found"})
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}