feat: add fetch model function

vite.config.ts

@@ -2,12 +2,66 @@ import { defineConfig } from 'vite'
 import react, { reactCompilerPreset } from '@vitejs/plugin-react'
 import babel from '@rolldown/plugin-babel'
 import tailwindcss from '@tailwindcss/vite'
+import type { IncomingMessage, ServerResponse } from 'node:http'
 
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [
     tailwindcss(),
     react(),
-    babel({ presets: [reactCompilerPreset()] })
+    babel({ presets: [reactCompilerPreset()] }),
+    {
+      name: 'router-proxy-middleware',
+      configureServer(server) {
+        server.middlewares.use('/api/fetch-models', async (req: IncomingMessage, res: ServerResponse) => {
+          if (req.method !== 'POST') {
+            res.statusCode = 405
+            res.end(JSON.stringify({ error: 'Method not allowed' }))
+            return
+          }
+
+          let body = ''
+          req.on('data', (chunk: Buffer) => {
+            body += chunk.toString()
+          })
+
+          req.on('end', async () => {
+            try {
+              const { baseUrl, apiKey } = JSON.parse(body || '{}')
+              if (!baseUrl) {
+                res.statusCode = 400
+                res.setHeader('Content-Type', 'application/json')
+                res.end(JSON.stringify({ error: 'baseUrl is required' }))
+                return
+              }
+
+              const targetUrl = `${baseUrl.replace(/\/+$/, '')}/models`
+              const headers: Record<string, string> = {
+                'Accept': 'application/json',
+              }
+              if (apiKey) {
+                headers['Authorization'] = `Bearer ${apiKey.trim()}`
+              }
+
+              const remoteRes = await fetch(targetUrl, {
+                method: 'GET',
+                headers,
+              })
+
+              const remoteData = await remoteRes.json().catch(() => null)
+
+              res.statusCode = remoteRes.status
+              res.setHeader('Content-Type', 'application/json')
+              res.end(JSON.stringify(remoteData || {}))
+            } catch (err: unknown) {
+              res.statusCode = 500
+              res.setHeader('Content-Type', 'application/json')
+              const msg = err instanceof Error ? err.message : 'Internal error'
+              res.end(JSON.stringify({ error: msg }))
+            }
+          })
+        })
+      },
+    },
   ],
 })