feat: add delete email setting api

api/src/main/java/com/databasir/api/Routes.java

@@ -95,6 +95,8 @@ public interface Routes {
         String GET_SYS_EMAIL = BASE + "/settings/sys_email";
 
         String UPDATE_SYS_EMAIL = BASE + "/settings/sys_email";
+
+        String DELETE_SYS_EMAIL = BASE + "/settings/sys_email";
     }
 
     interface Login {

api/src/main/java/com/databasir/api/SettingController.java

@@ -27,6 +27,12 @@ public class SettingController {
                 .orElseGet(JsonData::ok);
     }
 
+    @DeleteMapping(Routes.Setting.DELETE_SYS_EMAIL)
+    public JsonData<Void> deleteSysEmail() {
+        systemService.deleteSystemEmail();
+        return JsonData.ok();
+    }
+
     @PostMapping(Routes.Setting.UPDATE_SYS_EMAIL)
     @Operation(module = Operation.Modules.PROJECT, name = "更新邮件配置")
     public JsonData<Void> updateSystemEmailSetting(@RequestBody @Valid SystemEmailUpdateRequest request) {

core/src/main/java/com/databasir/core/domain/system/service/SystemService.java

@@ -83,6 +83,12 @@ public class SystemService {
                 });
     }
 
+    public void deleteSystemEmail() {
+        sysMailDao.selectOptionTopOne().ifPresent(d -> {
+            sysMailDao.deleteById(d.getId());
+        });
+    }
+
     public void updateEmailSetting(SystemEmailUpdateRequest request) {
         SysMailPojo sysMailPojo = new SysMailPojo();
         sysMailPojo.setSmtpHost(request.getSmtpHost());