test: add comprehensive test coverage and improve code quality

- Add new test files for auth, service, and handler modules
- Improve test organization and coverage
- Refactor code for better maintainability
- Add captcha, settings, stats, and theme handler tests
- Add auth module tests (CAS, OAuth, password, SSO, state)
- Add service layer tests for auth, export, permissions, roles
- All Go tests pass (exit code 0)
- All frontend tests pass (325 tests in 59 files)

internal/api/handler/device_handler.go

@@ -91,8 +91,8 @@ func (h *DeviceHandler) GetMyDevices(c *gin.Context) {
 		"message": "success",
 		"data": gin.H{
 			"items":     devices,
-			"total":    total,
-			"page":     page,
+			"total":     total,
+			"page":      page,
 			"page_size": pageSize,
 		},
 	})
@@ -305,8 +305,8 @@ func (h *DeviceHandler) GetUserDevices(c *gin.Context) {
 		"message": "success",
 		"data": gin.H{
 			"items":     devices,
-			"total":    total,
-			"page":     page,
+			"total":     total,
+			"page":      page,
 			"page_size": pageSize,
 		},
 	})
@@ -359,8 +359,8 @@ func (h *DeviceHandler) GetAllDevices(c *gin.Context) {
 		"message": "success",
 		"data": gin.H{
 			"items":     devices,
-			"total":    total,
-			"page":     req.Page,
+			"total":     total,
+			"page":      req.Page,
 			"page_size": req.PageSize,
 		},
 	})