docs: 更新 HTTP 错误码、用户积分、占卜运行及用户资料协议文档

.trellis/spec/backend/index.md

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+# Backend Development Guidelines
+
+> Best practices for backend development in this project.
+
+---
+
+## Overview
+
+This directory contains guidelines for backend development. Fill in each file with your project's specific conventions.
+
+---
+
+## Guidelines Index
+
+| Guide | Description | Status |
+|-------|-------------|--------|
+| [Directory Structure](./directory-structure.md) | Module organization and file layout | Filled |
+| [Database Guidelines](./database-guidelines.md) | ORM patterns, queries, migrations | Filled |
+| [Error Handling](./error-handling.md) | Error types, handling strategies | Filled |
+| [Quality Guidelines](./quality-guidelines.md) | Code standards, forbidden patterns | Filled |
+| [Logging Guidelines](./logging-guidelines.md) | Structured logging, log levels | Filled |
+
+---
+
+## 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**.