Add README with screenshots and project documentation

Refactor: Secure API keys using flutter_dotenv and remove hardcoded secrets

chore: Update version to 1.0.3+4; adjust targetSdk to 36 and versionCode to 4; disable code shrinking for stability

Refactor logging to use debugPrint for error handling in gamification services and notifications; add new investment news widgets for daily usage, financial breakdown, markdown display, risk assessment, and timeline; implement Rax AI client for chat completions; update app version and remove unused dependencies.

chore: Update awesome_notifications dependency to version 0.10.1

feat: Refactor AI service integration and enhance notification system with Awesome Notifications

feat: Implement gamification features including badges and streaks

Enhance AI analytics and investment roadmap generation with improved error handling and fallback mechanisms; update FinancialBreakdown component to display user budget and currency symbol.

Improve code formatting for consistency in HomePage widget

Add unit tests for AuthService, TheUser model, constants, database helper, and various widgets

Refactor code for improved readability in CategoryDonutChart and SpendingTrendCard components

Improve code formatting for better readability in AI analytics and insight card components

Refactor code for improved readability and consistency across multiple files

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