feat: 完成数据库种子数据系统开发

- 创建完整的种子数据系统 (seed_data.sql)
- 6个用户数据 (管理员 + 5个摄影师)
- 9个分类数据 (风景、人像、建筑、街拍、艺术、宠物、食物、旅行、黑白)
- 35张照片数据 (涵盖所有分类，均衡分布)
- 自动化执行脚本 (run_seed_data.sh)
- 数据质量测试脚本 (test_seed_data.sh)
- Makefile 集成 (make seed, make test-seed, make db-status)
- 完整的使用文档 (SEED_DATA_README.md)
- 数据库备份机制，时间戳命名
- 9项自动化测试全部通过，数据质量保证

任务12完成，项目完成率达到40%

backend/Makefile

@@ -76,6 +76,34 @@ status:
 	@echo "API Status:"
 	@curl -s http://localhost:8080/api/v1/health || echo "API is not running"
 
+# 种子数据管理
+seed:
+	@echo "Running seed data..."
+	@./run_seed_data.sh
+
+# 测试种子数据
+test-seed:
+	@echo "Testing seed data..."
+	@./test_seed_data.sh
+
+# 检查数据库状态
+db-status:
+	@echo "Database Status:"
+	@if [ -f "./data/photography.db" ]; then \
+		echo "Database exists"; \
+		echo "User count: $$(sqlite3 ./data/photography.db 'SELECT COUNT(*) FROM user;')"; \
+		echo "Category count: $$(sqlite3 ./data/photography.db 'SELECT COUNT(*) FROM category;')"; \
+		echo "Photo count: $$(sqlite3 ./data/photography.db 'SELECT COUNT(*) FROM photo;')"; \
+	else \
+		echo "Database not found"; \
+	fi
+
+# 重置数据库
+db-reset:
+	@echo "Resetting database..."
+	@rm -f ./data/photography.db
+	@echo "Database reset complete. Run 'make quick' to recreate."
+
 # 部署准备
 deploy-prep: clean install lint test build
 	@echo "Deployment preparation complete."
@@ -96,7 +124,11 @@ help:
 	@echo "  test       - Run tests"
 	@echo "  setup      - Create necessary directories"
 	@echo "  status     - Check API status"
+	@echo "  seed       - Run seed data script"
+	@echo "  test-seed  - Test seed data integrity"
+	@echo "  db-status  - Check database status"
+	@echo "  db-reset   - Reset database"
 	@echo "  deploy-prep - Prepare for deployment"
 	@echo "  help       - Show this help message"
 
-.PHONY: build run dev quick install gen gen-model clean lint fmt test setup status deploy-prep help
+.PHONY: build run dev quick install gen gen-model clean lint fmt test setup status seed test-seed db-status db-reset deploy-prep help