docs: 同步 AGENTS.md 至 Drizzle v1 beta 并添加开发原则

- 所有 AGENTS.md 新增「开发原则」：不向后兼容、改代码必须同步文档、前向迁移
- 根 AGENTS.md: 更新 Database 段落为 Drizzle v1 beta + postgres-js + RQBv2
- server AGENTS.md: 更新 tech stack、目录结构、ORPC 示例、数据库段落
  - drizzle-zod → drizzle-orm/zod
  - bun-sql → postgres-js
  - RQBv1 回调 → RQBv2 对象语法
  - 新增 relations.ts 和 DB instance 示例
- desktop AGENTS.md: 添加开发原则和文档同步规则

AGENTS.md

@@ -120,7 +120,13 @@ import type { ReactNode } from 'react'
 - ORPC: Use `ORPCError` with proper codes (`NOT_FOUND`, `INPUT_VALIDATION_FAILED`)
 - Never use empty catch blocks
 
-## Database (Drizzle ORM)
+## Database (Drizzle ORM v1 beta + postgres-js)
+
+- **ORM**: Drizzle ORM `1.0.0-beta` (RQBv2)
+- **Driver**: `drizzle-orm/postgres-js` (NOT `bun-sql`)
+- **Validation**: `drizzle-orm/zod` (built-in, NOT separate `drizzle-zod` package)
+- **Relations**: Defined via `defineRelations()` in `src/server/db/relations.ts`
+- **Query style**: RQBv2 object syntax (`orderBy: { createdAt: 'desc' }`, `where: { id: 1 }`)
 
 ```typescript
 export const myTable = pgTable('my_table', {
@@ -143,6 +149,14 @@ export const myTable = pgTable('my_table', {
 - Workspace packages use `"catalog:"` — never hardcode versions
 - Internal packages use `"workspace:*"` references
 
+## Development Principles
+
+> **These principles apply to ALL code changes. Agents MUST follow them on every task.**
+
+1. **No backward compatibility** — This project is in rapid iteration. Always use the latest API and patterns. Never keep deprecated code paths or old API fallbacks "just in case".
+2. **Always sync documentation** — When code changes, immediately update all related documentation (`AGENTS.md`, `README.md`, inline code examples). Code and docs must never drift apart. This includes updating code snippets in docs when imports, APIs, or patterns change.
+3. **Forward-only migration** — When upgrading dependencies, fully adopt the new API. Don't mix old and new patterns in the same codebase.
+
 ## Critical Rules
 
 **DO:**
@@ -150,6 +164,7 @@ export const myTable = pgTable('my_table', {
 - Use `@/*` path aliases (not relative imports)
 - Include `createdAt`/`updatedAt` on all tables
 - Use `catalog:` for dependency versions
+- Update `AGENTS.md` and other docs whenever code patterns change
 
 **DON'T:**
 - Use `npm`, `npx`, `node`, `yarn`, `pnpm` — always use `bun` / `bunx`
@@ -158,6 +173,7 @@ export const myTable = pgTable('my_table', {
 - Commit `.env` files
 - Use empty catch blocks `catch(e) {}`
 - Hardcode dependency versions in workspace packages
+- Leave docs out of sync with code changes
 
 ## Git Workflow