feat: Major updates to backend structure and security enhancements

- Removed `COMMON_ERRORS.md` file to streamline documentation.
- Added `Flask-Limiter` for rate limiting and `redis` for session management in `requirements.txt`.
- Expanded `ROADMAP.md` to include completed security features and planned enhancements for version 2.2.
- Enhanced `setup_myp.sh` for ultra-secure kiosk installation, including system hardening and security configurations.
- Updated `app.py` to integrate CSRF protection and improved logging setup.
- Refactored user model to include username and active status for better user management.
- Improved job scheduler with uptime tracking and task management features.
- Updated various templates for a more cohesive user interface and experience.

backend/app/node_modules/arg/index.d.ts

@@ -0,0 +1,44 @@
+declare function arg<T extends arg.Spec>(
+	spec: T,
+	options?: arg.Options
+): arg.Result<T>;
+
+declare namespace arg {
+	export const flagSymbol: unique symbol;
+
+	export function flag<T>(fn: T): T & { [arg.flagSymbol]: true };
+
+	export const COUNT: Handler<number> & { [arg.flagSymbol]: true };
+
+	export type Handler<T = any> = (
+		value: string,
+		name: string,
+		previousValue?: T
+	) => T;
+
+	export class ArgError extends Error {
+		constructor(message: string, code: string);
+
+		code: string;
+	}
+
+	export interface Spec {
+		[key: string]: string | Handler | [Handler];
+	}
+
+	export type Result<T extends Spec> = { _: string[] } & {
+		[K in keyof T]?: T[K] extends Handler
+			? ReturnType<T[K]>
+			: T[K] extends [Handler]
+			? Array<ReturnType<T[K][0]>>
+			: never;
+	};
+
+	export interface Options {
+		argv?: string[];
+		permissive?: boolean;
+		stopAtPositional?: boolean;
+	}
+}
+
+export = arg;