Add flexible Flask port configuration via environment variable
- Add FLASK_PORT environment variable support in docker-compose.yml - Update Flask app to read port from FLASK_PORT environment variable - Add FLASK_PORT configuration to .env and .env.example files - Enables running Flask on custom ports to avoid port conflicts in containerized environments 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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