Simplify system implementation

.trellis/spec/backend/index.md

@@ -1,38 +1,33 @@
-# Backend Development Guidelines
+# 后端开发规格
 
-> Best practices for backend development in this project.
+后端是 Python 3.12 + FastAPI 的单体服务。当前代码只包含启动组合、环境配置、运维端点和 `system` HTTP 切片；业务 bounded context 尚未创建。新增后端代码应先确认它属于启动边界、共享基础设施、HTTP 入口还是某个明确的 bounded context。
 
----
+## 规格导航
 
-## Overview
+| 规格 | 用途 |
+| --- | --- |
+| [目录与模块边界](./directory-structure.md) | 包结构、bounded context 和导入边界 |
+| [配置与运行时](./configuration-and-runtime.md) | `Settings`、应用工厂和部署环境 |
+| [HTTP 契约](./http-api-contracts.md) | 路由组合、响应模型和同源 API 路径 |
+| [错误处理](./error-handling.md) | 当前 FastAPI 错误行为及跨层错误传递 |
+| [质量与测试](./quality-guidelines.md) | Ruff、Pyright、pytest 及禁止模式 |
 
-This directory contains guidelines for backend development. Fill in each file with your project's specific conventions.
+## 开发前检查
 
----
+- 先阅读 `docs/adr/0001-bounded-context-first-modular-monolith.md`，确认新业务是否有清晰的语言和所有权边界。
+- 先阅读目标上下文的 `modules/<bounded_context>/README.md`（如已存在），再决定 domain、application、infrastructure、presentation 的位置。
+- 变更 HTTP 字段时同时检查 `zhixing-server/tests/`、前端 feature API 类型以及 `docs/adr/0002-use-a-same-origin-browser-api.md`。
+- 不要为了“未来可能需要”创建空的数据库、服务或日志层；当前仓库没有这些实现。
 
-## Guidelines Index
+## 质量检查
 
-| Guide | Description | Status |
-|-------|-------------|--------|
-| [Directory Structure](./directory-structure.md) | Module organization and file layout | To fill |
-| [Database Guidelines](./database-guidelines.md) | ORM patterns, queries, migrations | To fill |
-| [Error Handling](./error-handling.md) | Error types, handling strategies | To fill |
-| [Quality Guidelines](./quality-guidelines.md) | Code standards, forbidden patterns | To fill |
-| [Logging Guidelines](./logging-guidelines.md) | Structured logging, log levels | To fill |
+在 `zhixing-server/` 下运行：
 
----
+```bash
+uv run ruff format --check .
+uv run ruff check .
+uv run pyright
+uv run pytest
+```
 
-## How to Fill These Guidelines
-
-For each guideline file:
-
-1. Document your project's **actual conventions** (not ideals)
-2. Include **code examples** from your codebase
-3. List **forbidden patterns** and why
-4. Add **common mistakes** your team has made
-
-The goal is to help AI assistants and new team members understand how YOUR project works.
-
----
-
-**Language**: All documentation should be written in **English**.
+根目录 `./dev.sh check` 和 `./dev.sh test` 会执行完整前后端检查。