feat: 完成API测试、生产环境配置和文档编写

## 🧪 API测试系统完善
- 创建完整的单元测试套件 (tests/unit_test.go)
  - 认证流程、CRUD操作、文件上传测试
  - 中间件、错误处理、性能测试
- 创建集成测试套件 (tests/integration_test.go)
  - 业务流程、数据一致性、并发测试
- 创建综合API测试 (test_api_comprehensive.http)
  - 92个测试场景，覆盖所有API端点
- 更新Makefile添加测试命令
  - test-unit, test-integration, test-api, test-cover, test-bench

## 🗄️ 生产环境数据库配置
- Docker Compose生产环境配置 (configs/docker/docker-compose.prod.yml)
  - PostgreSQL 16 + Redis 7 + Nginx + 监控栈
- 数据库初始化脚本 (configs/docker/init-db.sql)
  - 完整表结构、索引优化、触发器、视图
- 生产环境配置脚本 (scripts/production-db-setup.sh)
  - 自动化配置、连接池、备份策略、监控

## 📚 API文档完善
- 完整的API文档 (docs/API_DOCUMENTATION.md)
  - 详细接口说明、请求响应示例
  - 认证流程、错误处理、性能优化
  - SDK支持、部署指南、安全考虑
- 包含cURL示例和Postman Collection支持

## 📊 项目进度
- 总进度: 50.0% → 57.5%
- 中优先级任务: 55% → 70%
- 并行完成3个重要任务，显著提升项目完成度

## 🎯 技术成果
- 测试覆盖率大幅提升，支持自动化测试
- 生产环境就绪，支持Docker部署
- 完整的API文档，便于前后端协作
- 性能优化和监控配置，确保生产稳定性

backend/Makefile

@@ -66,6 +66,43 @@ test:
 	@echo "Running tests..."
 	@go test -v ./...
 
+# 运行单元测试
+test-unit:
+	@echo "Running unit tests..."
+	@go test -v -short ./...
+
+# 运行集成测试
+test-integration:
+	@echo "Running integration tests..."
+	@go test -v -tags=integration ./tests/...
+
+# 运行 API 测试
+test-api:
+	@echo "Running API tests..."
+	@if pgrep -f "photography-api" > /dev/null; then \
+		echo "Server is running, starting API tests..."; \
+		go test -v -tags=api ./tests/...; \
+	else \
+		echo "Error: Server is not running. Please start the server first."; \
+		exit 1; \
+	fi
+
+# 生成测试覆盖率报告
+test-cover:
+	@echo "Generating test coverage report..."
+	@go test -coverprofile=coverage.out ./...
+	@go tool cover -html=coverage.out -o coverage.html
+	@echo "Coverage report generated: coverage.html"
+
+# 运行基准测试
+test-bench:
+	@echo "Running benchmark tests..."
+	@go test -bench=. -benchmem ./...
+
+# 运行所有测试
+test-all: test-unit test-integration test-bench test-cover
+	@echo "All tests completed."
+
 # 创建必要目录
 setup:
 	@echo "Setting up directories..."
@@ -189,7 +226,6 @@ help:
 	@echo "  clean      - Clean build artifacts"
 	@echo "  lint       - Run code linter"
 	@echo "  fmt        - Format code"
-	@echo "  test       - Run tests"
 	@echo "  setup      - Create necessary directories"
 	@echo "  status     - Check API status"
 	@echo "  seed       - Run seed data script"
@@ -198,6 +234,15 @@ help:
 	@echo "  db-reset   - Reset database"
 	@echo "  deploy-prep - Prepare for deployment"
 	@echo ""
+	@echo "Testing Commands:"
+	@echo "  test              - Run all tests"
+	@echo "  test-unit         - Run unit tests only"
+	@echo "  test-integration  - Run integration tests"
+	@echo "  test-api          - Run API tests (requires server running)"
+	@echo "  test-cover        - Generate test coverage report"
+	@echo "  test-bench        - Run benchmark tests"
+	@echo "  test-all          - Run comprehensive test suite"
+	@echo ""
 	@echo "Database Migration Commands:"
 	@echo "  migrate-status      - Show migration status"
 	@echo "  migrate-up          - Apply all pending migrations"
@@ -211,4 +256,4 @@ help:
 	@echo "  db-restore BACKUP=file - Restore from backup"
 	@echo "  help               - Show this help message"
 
-.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
+.PHONY: build run dev quick install gen gen-model clean lint fmt test test-unit test-integration test-api test-cover test-bench test-all setup status seed test-seed db-status db-reset deploy-prep help