fix: remove datasourceUrl from PrismaClient constructor (Prisma 7)

Prisma 7 no longer accepts datasourceUrl in constructor.
URL is resolved from DATABASE_URL env var automatically.

src/lib/prisma.ts

@@ -4,9 +4,6 @@ const globalForPrisma = globalThis as unknown as {
   prisma: PrismaClient | undefined;
 };
 
-export const prisma =
-  globalForPrisma.prisma ??
-  // @ts-expect-error -- Prisma 7 accepts datasourceUrl but types lag behind
-  new PrismaClient({ datasourceUrl: process.env.DATABASE_URL });
+export const prisma = globalForPrisma.prisma ?? new PrismaClient();
 
 if (process.env.NODE_ENV !== "production") globalForPrisma.prisma = prisma;