feat: add save feedback prompts, featured agent fields, dynamic Dify API config, and chat improvements

- Add success/error feedback messages near submit buttons in all admin forms
- Display success prompt for 1s before redirect after save
- Show API error details on save failure
- Add isFeatured/featuredOrder fields to Agent model and admin UI
- Add difyApiUrl/difyApiKey fields for per-agent Dify API configuration
- Show featured badge column in agent admin list
- Display featured agents on homepage sorted by order
- Refactor chat page streaming with AbortController and stable userId
- Improve Dify API proxy to use per-agent credentials

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

@@ -17,10 +17,14 @@ export async function PUT(
         description: data.description,
         icon: data.icon || null,
         categoryId: data.categoryId ? parseInt(data.categoryId) : null,
+        difyApiUrl: data.difyApiUrl || null,
+        difyApiKey: data.difyApiKey || null,
         features: data.features || "",
         hotQuestions: data.hotQuestions || "[]",
         quickQuestions: data.quickQuestions || "[]",
         status: data.status || "active",
+        isFeatured: data.isFeatured ?? false,
+        featuredOrder: data.featuredOrder ?? 0,
       },
     })
     return NextResponse.json(agent)

app/api/admin/agents/route.ts

@@ -12,10 +12,14 @@ export async function POST(request: NextRequest) {
         description: data.description,
         icon: data.icon || null,
         categoryId: data.categoryId ? parseInt(data.categoryId) : null,
+        difyApiUrl: data.difyApiUrl || null,
+        difyApiKey: data.difyApiKey || null,
         features: data.features || "",
         hotQuestions: data.hotQuestions || "[]",
         quickQuestions: data.quickQuestions || "[]",
         status: data.status || "active",
+        isFeatured: data.isFeatured ?? false,
+        featuredOrder: data.featuredOrder ?? 0,
       },
     })
     return NextResponse.json(agent)

app/api/chat/route.ts

@@ -1,33 +1,51 @@
 import { NextResponse } from "next/server"
+import { prisma } from "@/app/lib/prisma"
 
-const API_KEY = 'app-lbe2lglt7taGtZk0dG7pAhbx'
-const API_URL = 'http://df.clkeji.com/v1/chat-messages'
+const FALLBACK_API_KEY = 'app-lbe2lglt7taGtZk0dG7pAhbx'
+const FALLBACK_API_URL = 'http://df.clkeji.com/v1/chat-messages'
 
 export async function POST(request: Request) {
   try {
     const body = await request.json()
+    const { agentId, ...difyBody } = body
 
-    const response = await fetch(API_URL, {
-      method: 'POST',
-      headers: {
-        'Authorization': `Bearer ${API_KEY}`,
-        'Content-Type': 'application/json',
-      },
-      body: JSON.stringify(body),
-    })
+    let apiKey = FALLBACK_API_KEY
+    let apiUrl = FALLBACK_API_URL
 
-    if (body.response_mode === 'streaming') {
-      return new NextResponse(response.body, {
-        headers: {
-          'Content-Type': 'text/event-stream',
-          'Cache-Control': 'no-cache',
-          'Connection': 'keep-alive',
-        },
+    if (agentId) {
+      const agent = await prisma.agent.findUnique({
+        where: { id: parseInt(agentId) },
       })
+      if (agent?.difyApiUrl && agent?.difyApiKey) {
+        apiUrl = agent.difyApiUrl.replace(/\/+$/, '') + '/chat-messages'
+        apiKey = agent.difyApiKey
+      }
     }
 
-    const data = await response.json()
-    return NextResponse.json(data)
+    const response = await fetch(apiUrl, {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${apiKey}`,
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({ ...difyBody, response_mode: 'streaming' }),
+    })
+
+    if (!response.ok) {
+      const text = await response.text()
+      console.error('Dify API error:', response.status, text.slice(0, 500))
+      return NextResponse.json(
+        { error: 'Dify request failed' },
+        { status: 502 }
+      )
+    }
+
+    const headers = new Headers()
+    headers.set('Content-Type', 'text/event-stream')
+    headers.set('Cache-Control', 'no-cache')
+    headers.set('Connection', 'keep-alive')
+
+    return new Response(response.body, { headers })
   } catch (error) {
     console.error('Chat API error:', error)
     return NextResponse.json(