TRELLIS1 迁移 Trellis 主导开发流程

.trellis/spec/backend/index.md

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+# Backend Development Guidelines
+
+---
+
+## Overview
+
+hyb-oa backend work uses Fastify, Prisma and PostgreSQL under `server/`.
+The project-specific backend rules live in `../hyb-oa/backend-fastify-prisma.md`;
+the files in this directory are Trellis default scaffolding and may be expanded
+only when a later task needs deeper backend conventions.
+
+---
+
+## Guidelines Index
+
+| Guide | Description | Status |
+|-------|-------------|--------|
+| [hyb-oa Backend Rules](../hyb-oa/backend-fastify-prisma.md) | Current project backend rules | Current |
+| [Directory Structure](./directory-structure.md) | Module organization and file layout | Scaffold |
+| [Database Guidelines](./database-guidelines.md) | ORM patterns, queries, migrations | Scaffold |
+| [Error Handling](./error-handling.md) | Error types, handling strategies | Scaffold |
+| [Quality Guidelines](./quality-guidelines.md) | Code standards, forbidden patterns | Scaffold |
+| [Logging Guidelines](./logging-guidelines.md) | Structured logging, log levels | Scaffold |
+
+---
+
+## Language
+
+Project rules are Chinese-first where they are user-facing. Short English files
+generated by Trellis may remain when they are tool-facing scaffolding.