feat: Initialize Flutter app with authentication and scheduling features

- Removed TypeScript configuration file (tsconfig.json).
- Added Flutter plugin dependencies for secure storage.
- Implemented main application structure with routing for login, profile, and schedule screens.
- Developed LoginScreen with authentication logic and user feedback.
- Created ProfileScreen to display user profile information and logout functionality.
- Built ScheduleScreen to show weekly work schedule with navigation controls.
- Integrated AuthService for handling authentication, token storage, and API interactions.
- Updated pubspec.yaml with necessary dependencies for the Flutter project.

.gitignore

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-# Learn more https://docs.github.com/en/get-started/getting-started-with-git/ignoring-files
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-# dependencies
-node_modules/
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-# Expo
-.expo/
-dist/
-web-build/
-expo-env.d.ts
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-# Native
-.kotlin/
-*.orig.*
-*.jks
-*.p8
-*.p12
-*.key
-*.mobileprovision
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-# Metro
-.metro-health-check*
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-# debug
-npm-debug.*
-yarn-debug.*
-yarn-error.*
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-# macOS
-.DS_Store
-*.pem
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-# local env files
-.env*.local
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-# typescript
-*.tsbuildinfo
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-app-example