feat: enhance agent system with hot/quick questions, dynamic chat UI, and new enterprise agents

- Add hotQuestions and quickQuestions fields to agent model
- Update admin form with textarea inputs for hot/quick questions
- Make chat page display dynamic agent data (name, icon, questions)
- Widen center chat area to 60% for better readability
- Add enterprise service category and 3 new agents (jiaotou, promotion, group-policy)
- Update Prisma schema formatting and seed data

app/api/admin/agents/[id]/route.ts

@@ -18,11 +18,14 @@ export async function PUT(
         icon: data.icon || null,
         categoryId: data.categoryId ? parseInt(data.categoryId) : null,
         features: data.features || "",
+        hotQuestions: data.hotQuestions || "[]",
+        quickQuestions: data.quickQuestions || "[]",
         status: data.status || "active",
       },
     })
     return NextResponse.json(agent)
   } catch (error) {
+    console.error('PUT /api/admin/agents error:', error)
     return NextResponse.json({ error: "更新失败" }, { status: 500 })
   }
 }