feat: Implement Supabase client initialization, including environment variable validation and a connectivity test.

feat: add Supabase client initialization with environment variable validation.

feat: Implement secure data storage and retrieval services with encryption/decryption and add local mock tests for API endpoints.

feat: Add secure message storage and retrieval via Supabase with burn and retrieval limit options.

refactor: modularize application by extracting core logic into dedicated services, security, database, and router modules.

feat: Implement QEcho client with send/get functionality, update README, and add a .gitignore file

feat: Introduce 'burn after reading' functionality for message retrieval and a new CLI tool.

feat: Implement blind indexing with a twin key generator for secure multi-user data storage and retrieval, and add a new test script demonstrating its functionality.

feat: Integrate Supabase for persistent data storage, replacing the in-memory mock database and updating store/retrieve operations.

feat: Implement encrypted data storage and retrieval endpoints using FastAPI and cryptography, and update the README.

feat: Add initial FastAPI "Hello World" application with Docker setup.

initial commit