feat(app): update debug syntax, refactor HTTP status codes

- Updated import and usage of `isDebugMode` function across multiple controllers and services for better readability
- Improved the use of HTTP status codes in `auth.controller.ts` for more accurate responses
- Refactored HTTP status codes `HttpStatusCode` enum to include detailed comments

Signed-off-by: Mathis <yidhra@tuta.io>

src/utils/debugState.ts

@@ -1,9 +1,8 @@
 import process from "node:process";
 
-
 export function isDebugMode() {
-	if (process.env["DEBUG"] === 'true') {
+	if (process.env["DEBUG"] === "true") {
 		return true;
 	}
 	return false;
-}
+}