fix: 修复Spring Boot兼容性问题并添加链接删除功能

主要修改:
1. 降级Spring Boot版本到2.7.18以兼容MyBatis-Plus
2. 修复所有validation包导入路径 (jakarta -> javax)
3. 修复ResponseStatusException API调用
4. 降级Swagger版本以兼容Spring Boot 2.x
5. 添加单个和批量删除链接功能
6. 修复JWT认证中的Claims获取方式
7. 优化代码格式和日志输出

技术细节:
- Spring Boot: 3.3.3 -> 2.7.18
- Swagger: springdoc-openapi-starter-webflux-ui:2.3.0 -> springdoc-openapi-webflux-ui:1.7.0
- 所有javax.validation包路径修复
- 新增BatchDeleteRequest和BatchDeleteResponse DTO类
- LinkController中添加DELETE和POST批量删除接口

src/main/java/com/gameplatform/server/model/dto/link/BatchDeleteRequest.java

@@ -0,0 +1,35 @@
+package com.gameplatform.server.model.dto.link;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.Size;
+import java.util.List;
+
+/**
+ * 批量删除链接请求DTO
+ * 
+ * @author GamePlatform
+ */
+@Schema(description = "批量删除链接请求")
+public class BatchDeleteRequest {
+    
+    @NotEmpty(message = "删除的链接编号列表不能为空")
+    @Size(max = 100, message = "单次最多只能删除100个链接")
+    @Schema(description = "要删除的链接编号列表", example = "[\"EPRGF7ZJ\", \"XKLD9F2M\", \"QWER5TYU\"]", required = true)
+    private List<String> codeNos;
+    
+    public BatchDeleteRequest() {}
+    
+    public BatchDeleteRequest(List<String> codeNos) {
+        this.codeNos = codeNos;
+    }
+    
+    public List<String> getCodeNos() {
+        return codeNos;
+    }
+    
+    public void setCodeNos(List<String> codeNos) {
+        this.codeNos = codeNos;
+    }
+}

src/main/java/com/gameplatform/server/model/dto/link/BatchDeleteResponse.java

@@ -0,0 +1,106 @@
+package com.gameplatform.server.model.dto.link;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+import java.util.List;
+
+/**
+ * 批量删除链接响应DTO
+ * 
+ * @author GamePlatform
+ */
+@Schema(description = "批量删除链接响应")
+public class BatchDeleteResponse {
+    
+    @Schema(description = "成功删除的数量", example = "3")
+    private int successCount;
+    
+    @Schema(description = "删除失败的数量", example = "1")
+    private int failedCount;
+    
+    @Schema(description = "总数量", example = "4")
+    private int totalCount;
+    
+    @Schema(description = "成功删除的链接编号列表", example = "[\"EPRGF7ZJ\", \"XKLD9F2M\"]")
+    private List<String> successCodeNos;
+    
+    @Schema(description = "删除失败的链接编号列表", example = "[\"QWER5TYU\"]")
+    private List<String> failedCodeNos;
+    
+    @Schema(description = "删除失败的原因列表", example = "[\"链接不存在或无权删除\"]")
+    private List<String> failedReasons;
+    
+    @Schema(description = "是否全部成功", example = "false")
+    private boolean allSuccess;
+    
+    public BatchDeleteResponse() {}
+    
+    public BatchDeleteResponse(int successCount, int failedCount, int totalCount, 
+                              List<String> successCodeNos, List<String> failedCodeNos, 
+                              List<String> failedReasons) {
+        this.successCount = successCount;
+        this.failedCount = failedCount;
+        this.totalCount = totalCount;
+        this.successCodeNos = successCodeNos;
+        this.failedCodeNos = failedCodeNos;
+        this.failedReasons = failedReasons;
+        this.allSuccess = failedCount == 0;
+    }
+    
+    // Getters and Setters
+    public int getSuccessCount() {
+        return successCount;
+    }
+    
+    public void setSuccessCount(int successCount) {
+        this.successCount = successCount;
+    }
+    
+    public int getFailedCount() {
+        return failedCount;
+    }
+    
+    public void setFailedCount(int failedCount) {
+        this.failedCount = failedCount;
+    }
+    
+    public int getTotalCount() {
+        return totalCount;
+    }
+    
+    public void setTotalCount(int totalCount) {
+        this.totalCount = totalCount;
+    }
+    
+    public List<String> getSuccessCodeNos() {
+        return successCodeNos;
+    }
+    
+    public void setSuccessCodeNos(List<String> successCodeNos) {
+        this.successCodeNos = successCodeNos;
+    }
+    
+    public List<String> getFailedCodeNos() {
+        return failedCodeNos;
+    }
+    
+    public void setFailedCodeNos(List<String> failedCodeNos) {
+        this.failedCodeNos = failedCodeNos;
+    }
+    
+    public List<String> getFailedReasons() {
+        return failedReasons;
+    }
+    
+    public void setFailedReasons(List<String> failedReasons) {
+        this.failedReasons = failedReasons;
+    }
+    
+    public boolean isAllSuccess() {
+        return allSuccess;
+    }
+    
+    public void setAllSuccess(boolean allSuccess) {
+        this.allSuccess = allSuccess;
+    }
+}