feat: integrate environment configuration into development workflow

- Auto-create .env file from template during setup-dev
- Add validate-config target to Makefile for configuration validation
- Update check-uv.sh to use environment variable for GitHub URL
- Provide helpful setup messages and next steps for developers

Makefile

@@ -4,7 +4,7 @@
 .PHONY: help install install-dev clean test test-cov lint format type-check
 .PHONY: server cli demo docker-build docker-dev docker-prod docker-test
 .PHONY: pre-commit setup-dev deps-update deps-check security-check
-.PHONY: build package publish docs release
+.PHONY: build package publish docs release validate-config
 
 # Default target
 .DEFAULT_GOAL := help
@@ -48,6 +48,11 @@ setup-dev: check-uv ## Set up development environment with uv
 	uv venv --python python3
 	$(call success,Virtual environment created)
 	@$(MAKE) install-dev
+	@if [ ! -f ".env" ] && [ -f ".env.example" ]; then \
+		echo -e "$(BLUE)$(INFO_SYMBOL)$(NC) Creating .env file from template..."; \
+		cp .env.example .env; \
+		echo -e "$(GREEN)$(SUCCESS_SYMBOL)$(NC) .env file created. Please review and customize the settings."; \
+	fi
 	@if [ -f ".pre-commit-config.yaml" ]; then \
 		echo -e "$(BLUE)$(INFO_SYMBOL)$(NC) Installing pre-commit hooks..."; \
 		. $(VENV_PATH)/bin/activate && pre-commit install; \
@@ -196,13 +201,21 @@ cli: ## Run CLI with help
 	fi
 
 demo: ## Run interactive demo
-	$(call info,Starting interactive demo...)
+	$(call header,UnitForge Demo)
 	@if [ -f "$(VENV_PATH)/bin/activate" ]; then \
 		. $(VENV_PATH)/bin/activate && ./demo.sh; \
 	else \
 		./demo.sh; \
 	fi
 
+validate-config: ## Validate environment configuration
+	$(call header,Validating Configuration)
+	@if [ -f "$(VENV_PATH)/bin/activate" ]; then \
+		. $(VENV_PATH)/bin/activate && python scripts/validate_config.py; \
+	else \
+		python3 scripts/validate_config.py; \
+	fi
+
 # Docker targets
 docker-build: ## Build Docker images
 	$(call info,Building Docker images...)

check-uv.sh

@@ -233,7 +233,7 @@ fi
 
 echo ""
 echo -e "${CYAN}For more information:${NC}"
-echo -e "  ${BLUE}UnitForge: https://github.com/unitforge/unitforge${NC}"
+echo -e "  ${BLUE}UnitForge: ${GITHUB_URL:-https://github.com/will666/unitforge}${NC}"
 echo -e "  ${BLUE}uv docs: https://github.com/astral-sh/uv${NC}"
 
 # Exit with appropriate code