refactor: 降级 Drizzle ORM 至 0.45.x 稳定版，对齐 Better Auth 兼容性

- drizzle-orm 1.0.0-beta.15 → 0.45.2, drizzle-kit → 0.31.10
- RQBv2 defineRelations() → 旧版 relations() 回调语法
- drizzle-orm/zod → drizzle-zod 独立包
- auth/schema.ts 改由 Better Auth CLI 生成（bun run db:auth）
- db/schema/index.ts 选择性导出表（不导出生成文件中的旧版 relations）
- 删除 db:push script，强制 db:generate → db:migrate 工作流
- 重建迁移基线（删除旧迁移目录，全新生成初始迁移）

apps/server/src/modules/bookmarks/router.ts

@@ -10,11 +10,11 @@ export const category = {
     .use(authMiddleware)
     .handler(async ({ context }) => {
       return await context.db.query.category.findMany({
-        where: { userId: context.user.id },
-        orderBy: { orderId: 'asc' },
+        where: (category, { eq }) => eq(category.userId, context.user.id),
+        orderBy: (category, { asc }) => asc(category.orderId),
         with: {
           bookmarks: {
-            orderBy: { orderId: 'asc' },
+            orderBy: (bookmark, { asc }) => asc(bookmark.orderId),
           },
         },
       })