Update application code and dependencies

prisma/schema.prisma

@@ -0,0 +1,82 @@
+// 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"
+}
+
+datasource db {
+  provider = "sqlite"
+  url      = env("DATABASE_URL")
+}
+
+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
+  conversations Conversation[]
+}
+
+model Category {
+  id        Int      @id @default(autoincrement())
+  name      String   @unique
+  icon      String?
+  description String?
+  agents    Agent[]
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+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
+  conversations Conversation[]
+}
+
+model News {
+  id        Int      @id @default(autoincrement())
+  title     String
+  content   String
+  type      String   @default("news")
+  published Boolean   @default(false)
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model Conversation {
+  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")
+  messages  Message[]
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model Message {
+  id             Int        @id @default(autoincrement())
+  conversationId Int
+  conversation   Conversation @relation(fields: [conversationId], references: [id], onDelete: Cascade)
+  role           String     // 'user' 或 'assistant'
+  content        String
+  timestamp      DateTime   @default(now())
+  createdAt      DateTime   @default(now())
+  updatedAt      DateTime   @updatedAt
+}