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

prisma/schema.prisma

@@ -1,6 +1,3 @@
-// This is your Prisma schema file,
-// learn more about it in the docs: https://pris.ly/d/prisma-schema
-
 generator client {
   provider = "prisma-client-js"
 }
@@ -11,40 +8,42 @@ datasource db {
 }
 
 model User {
-  id        Int      @id @default(autoincrement())
-  email     String   @unique
-  username  String   @unique
-  password  String
-  name      String?
-  role      String   @default("admin")
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
+  id            Int            @id @default(autoincrement())
+  email         String         @unique
+  username      String         @unique
+  password      String
+  name          String?
+  role          String         @default("admin")
+  createdAt     DateTime       @default(now())
+  updatedAt     DateTime       @updatedAt
   conversations Conversation[]
 }
 
 model Category {
-  id        Int      @id @default(autoincrement())
-  name      String   @unique
-  icon      String?
+  id          Int      @id @default(autoincrement())
+  name        String   @unique
+  icon        String?
   description String?
-  agents    Agent[]
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+  agents      Agent[]
 }
 
 model Agent {
-  id          Int      @id @default(autoincrement())
-  name        String
-  slug        String   @unique
-  description String
-  icon        String?
-  categoryId  Int?
-  category    Category? @relation(fields: [categoryId], references: [id])
-  features    String   @default("")
-  usageCount  Int      @default(0)
-  status      String   @default("active")
-  createdAt   DateTime @default(now())
-  updatedAt   DateTime @updatedAt
+  id            Int            @id @default(autoincrement())
+  name          String
+  slug          String         @unique
+  description   String
+  icon          String?
+  categoryId    Int?
+  features         String         @default("")
+  hotQuestions     String         @default("[]")
+  quickQuestions   String         @default("[]")
+  usageCount       Int            @default(0)
+  status           String         @default("active")
+  createdAt     DateTime       @default(now())
+  updatedAt     DateTime       @updatedAt
+  category      Category?      @relation(fields: [categoryId], references: [id])
   conversations Conversation[]
 }
 
@@ -53,30 +52,30 @@ model News {
   title     String
   content   String
   type      String   @default("news")
-  published Boolean   @default(false)
+  published Boolean  @default(false)
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 }
 
 model Conversation {
-  id        Int      @id @default(autoincrement())
+  id        Int       @id @default(autoincrement())
   agentId   Int
-  agent     Agent    @relation(fields: [agentId], references: [id], onDelete: Cascade)
   userId    Int?
-  user      User?    @relation(fields: [userId], references: [id], onDelete: SetNull)
-  title     String   @default("新对话")
+  title     String    @default("新对话")
+  createdAt DateTime  @default(now())
+  updatedAt DateTime  @updatedAt
+  user      User?     @relation(fields: [userId], references: [id])
+  agent     Agent     @relation(fields: [agentId], references: [id], onDelete: Cascade)
   messages  Message[]
-  createdAt DateTime @default(now())
-  updatedAt DateTime @updatedAt
 }
 
 model Message {
-  id             Int        @id @default(autoincrement())
+  id             Int          @id @default(autoincrement())
   conversationId Int
-  conversation   Conversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
-  role           String     // 'user' 或 'assistant'
+  role           String
   content        String
-  timestamp      DateTime   @default(now())
-  createdAt      DateTime   @default(now())
-  updatedAt      DateTime   @updatedAt
+  timestamp      DateTime     @default(now())
+  createdAt      DateTime     @default(now())
+  updatedAt      DateTime     @updatedAt
+  conversation   Conversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
 }