fix: agent_card PrismaClient import and schema capabilities

apps/web/prisma/schema.prisma

@@ -122,6 +122,7 @@ model AgentProfile {
   type            String       // BUILDER or SCOUT
   wallet_address  String?
   status          String       // WHITELISTED, BANNED, PENDING
+  capabilities    Json?
   created_at      DateTime     @default(now())
   updated_at      DateTime     @updatedAt