feat: Enhance validation and permissions handling across controllers

- Added `ValidatedJson` extractor for automatic JSON validation in `events_controller.rs`, `testimonials_controller.rs`, `mentors_controller.rs`, `gacha_items_controller.rs`, and `hackathon_controller.rs`.
- Replaced manual permission checks with `require_permissions!` and `require_auth!` macros in relevant controllers to streamline permission handling.
- Introduced `sanitization` utilities in `sanitization.rs` for improved input sanitization.
- Added `permission_macros.rs` to encapsulate permission checking logic and reduce boilerplate.
- Updated dependencies in `Cargo.toml` to include `serde_json` and `validator`.
- Implemented error handling improvements in `notification_service.rs` for better response management.

imphnen-gacha/src/v1/gacha_items/gacha_items_service.rs

@@ -1,6 +1,6 @@
 use crate::AppState;
 use imphnen_entities::{MetaRequestDto, ResponseListSuccessDto, ResponseSuccessDto};
-use imphnen_utils::{common_response, make_thing, success_list_response, success_response, validate_request};
+use imphnen_utils::{common_response, make_thing, success_list_response, success_response};
 use crate::v1::gacha_items::GachaItemDto;
 use crate::v1::gacha_items::gacha_items_dto::{GachaItemRequestDto, GachaItemUpdateRequestDto};
 use crate::v1::gacha_items::gacha_items_repository::GachaItemRepository;
@@ -44,9 +44,7 @@ impl GachaItemService {
 		state: &AppState,
 		payload: GachaItemRequestDto,
 	) -> Response {
-		if let Err((status, message)) = validate_request(&payload) {
-			return common_response(status, &message);
-		}
+		// Validation is now automatic via ValidatedJson extractor
 		let repo = GachaItemRepository::new(state);
 		let schema = GachaItemSchema {
 			id: make_thing(&ResourceEnum::GachaItems.to_string(), &payload.name), // Fixed: Use payload.name or some other identifier
@@ -65,9 +63,7 @@ impl GachaItemService {
 		payload: GachaItemUpdateRequestDto,
 		id: String,
 	) -> Response {
-		if let Err((status, message)) = validate_request(&payload) {
-			return common_response(status, &message);
-		}
+		// Validation is now automatic via ValidatedJson extractor
 		let repo = GachaItemRepository::new(state);
 		
 		// Get current gacha item data first