refactor(db): 移除 drizzle() 多余的 schema 参数，RQBv2 只需 relations

apps/server/AGENTS.md

@@ -164,11 +164,10 @@ export const relations = defineRelations(schema, (r) => ({
 // src/server/db/index.ts
 import { drizzle } from 'drizzle-orm/postgres-js'
 import { relations } from '@/server/db/relations'
-import * as schema from '@/server/db/schema'
+// In RQBv2, relations already contain schema info — no separate schema import needed
 
 const db = drizzle({
   connection: env.DATABASE_URL,
-  schema,
   relations,
 })
 ```
@@ -272,4 +271,5 @@ export const env = createEnv({
 - Import from `drizzle-zod` (use `drizzle-orm/zod` instead)
 - Use RQBv1 callback-style `orderBy` / old `relations()` API
 - Use `drizzle-orm/bun-sql` driver (use `drizzle-orm/postgres-js`)
+- Pass `schema` to `drizzle()` constructor (only `relations` is needed in RQBv2)
 - Leave docs out of sync with code changes