fix: 修改删除记录接口为POST方法

- 后端RecordController改用POST方法处理删除请求
- 小程序端api.js同步修改为POST方法
- 解决DELETE请求不被支持的问题

src/main/java/xuan/controller/RecordController.java

@@ -94,10 +94,11 @@ public class RecordController {
         return result;
     }
     
-    @DeleteMapping("/delete")
-    public Map<String, Object> deleteRecord(@RequestParam Long id) {
+    @PostMapping("/delete")
+    public Map<String, Object> deleteRecord(@RequestBody Map<String, Object> params) {
         Map<String, Object> result = new HashMap<>();
         try {
+            Long id = Long.parseLong(params.get("id").toString());
             recordService.deleteById(id);
             result.put("success", true);
             result.put("message", "删除成功");
@@ -108,10 +109,11 @@ public class RecordController {
         return result;
     }
     
-    @DeleteMapping("/clear")
-    public Map<String, Object> clearRecords(@RequestParam String userId) {
+    @PostMapping("/clear")
+    public Map<String, Object> clearRecords(@RequestBody Map<String, Object> params) {
         Map<String, Object> result = new HashMap<>();
         try {
+            String userId = params.get("userId").toString();
             recordService.deleteByUserId(userId);
             result.put("success", true);
             result.put("message", "清空成功");