增加ip 的白名單

總共7個IP地址，分佈在4個地點：
岡山：1個IP
汐止：2個IP
新竹：2個IP
璟茂：2個IP

app/api/ip/route.ts

@@ -0,0 +1,29 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getClientIp, isIpAllowed } from '@/lib/ip-utils'
+
+// 強制動態渲染
+export const dynamic = 'force-dynamic'
+
+export async function GET(request: NextRequest) {
+  try {
+    const clientIp = getClientIp(request)
+    const allowedIps = process.env.ALLOWED_IPS || ''
+    const enableIpWhitelist = process.env.ENABLE_IP_WHITELIST === 'true'
+    
+    const isAllowed = enableIpWhitelist ? isIpAllowed(clientIp, allowedIps) : true
+    
+    return NextResponse.json({
+      ip: clientIp,
+      isAllowed,
+      enableIpWhitelist,
+      allowedIps: enableIpWhitelist ? allowedIps.split(',').map(ip => ip.trim()) : [],
+      timestamp: new Date().toISOString()
+    })
+  } catch (error) {
+    console.error('Error getting IP info:', error)
+    return NextResponse.json(
+      { error: '無法獲取IP信息' },
+      { status: 500 }
+    )
+  }
+}