refactor(db): migrate app pages and APIs from Prisma facade to Drizzle (4)

Co-authored-by: Cursor <[email protected]>

src/app/api/online/count/route.ts

@@ -3,18 +3,23 @@
 // `online` is the emulator's string flag "1" / "0" (see User model). Returns
 // { count: 0 } (never 500) on DB failure.
 
+import { count, eq } from "drizzle-orm";
 import { apiJson } from "@/lib/api";
 import { cached } from "@/lib/cache";
-import { prisma } from "@/lib/prisma";
+import { db, User } from "@/lib/db";
 
 export const dynamic = "force-dynamic";
 
 export async function GET(_req: Request) {
 	try {
-		const count = await cached("online_count", 10_000, () =>
-			prisma.user.count({ where: { online: "1" } }),
-		);
-		return apiJson({ count });
+		const result = await cached("online_count", 10_000, async () => {
+			const [row] = await db
+				.select({ total: count() })
+				.from(User)
+				.where(eq(User.online, "1"));
+			return row?.total ?? 0;
+		});
+		return apiJson({ count: result });
 	} catch {
 		return apiJson({ count: 0 });
 	}