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[syed-mujtaba-stack]

This PR upgrades the existing Chat Application into a secure, scalable AI-Powered Todo Chatbot by refactoring the core architecture, fixing security flaws, and adding major new features including task management and AI chat support.

🔧 Architecture Refactor (Security & Stability)
❌ Previous Issues

Client connected directly to MySQL, exposing DB credentials.

Required a local database installation on every client machine.

Tight coupling between UI and persistence logic.

✅ Improvements

Implemented a Thin Client / Server-centric architecture.

Moved all database logic to the server via db_manager.py.

Replaced MySQL with SQLite (chatbot.db) for zero-config portability.

Added a secure AUTH handshake protocol between Client and Server.

This significantly improves security, deployment simplicity, and maintainability.

✨ New Features
📝 Todo List Management

Added a dedicated Todo List tab in the GUI.

Users can:

Add tasks

List tasks

Mark tasks as completed

Tasks are persisted server-side and survive restarts.

🤖 AI Chat Integration

Added an AI Bot users can chat with.

Introduced AIHandler abstraction for LLM routing.

Ready for Gemini / OpenAI API keys via environment variables.

Falls back to Echo Mode when no API key is provided.

🧹 Code Quality & Testing

Refactored Server.py to cleanly handle multiple command types.

Simplified and stabilized threading logic in Client.py.

Added verification and regression tests:

test_architecture.py – Auth & client/server separation

test_todos.py – Todo CRUD logic

test_ai.py – AI bot response handling

Added .env.example and improved .gitignore.

✅ Verification Checklist

Server runs without external dependencies

Client authenticates using server-side auth

Todos persist across restarts

AI Bot responds correctly

[syed-mujtaba-stack]

Hi 👋
This PR introduces a full architecture refactor along with Todo and AI chat features.
Happy to make changes or improvements based on feedback. Thanks for reviewing!