chore: add Makefile with development commands

Makefile

@@ -0,0 +1,43 @@
+.PHONY: install run dev clean deploy help
+
+# Python configuration
+PYTHON = python3
+VENV = .venv
+VENV_PYTHON = $(VENV)/bin/python
+VENV_PIP = $(VENV)/bin/pip
+PORT = 7860
+
+help: ## Show this help message
+	@echo ""
+	@echo "  🏗️  CodeAtlas - Commands"
+	@echo "  ========================"
+	@echo ""
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[36m%-12s\033[0m %s\n", $$1, $$2}'
+	@echo ""
+
+install: ## Create venv and install dependencies
+	@echo "📦 Creating virtual environment..."
+	@$(PYTHON) -m venv $(VENV)
+	@$(VENV_PIP) install --upgrade pip
+	@$(VENV_PIP) install -r requirements.txt
+	@echo "✅ Done! Run 'make run' to start"
+
+run: ## Run the application
+	@lsof -ti:$(PORT) | xargs kill -9 2>/dev/null || true
+	@echo "🚀 Starting CodeAtlas on http://localhost:$(PORT)"
+	@$(VENV_PYTHON) app.py
+
+dev: ## Run with auto-reload
+	@lsof -ti:$(PORT) | xargs kill -9 2>/dev/null || true
+	@echo "🔧 Starting in dev mode..."
+	@GRADIO_WATCH_DIRS=. $(VENV_PYTHON) app.py
+
+deploy: ## Deploy backend to Modal
+	@echo "☁️  Deploying to Modal..."
+	@modal deploy modal_backend.py
+	@echo "✅ Deployed!"
+
+clean: ## Remove venv and cache files
+	@rm -rf $(VENV) __pycache__ src/**/__pycache__ .session_state.json
+	@rm -rf data/diagrams/* data/audios/* data/logs/*
+	@echo "✅ Cleaned!"