补充方案

server/push-server.js

@@ -9,7 +9,13 @@ const bodyParser = require('body-parser')
 const cors = require('cors')
 const fs = require('fs').promises
 const path = require('path')
-const fetch = require('node-fetch')
+const fetchImpl = (globalThis.fetch ? globalThis.fetch.bind(globalThis) : (() => {
+  try {
+    return require('node-fetch')
+  } catch (e) {
+    throw new Error("No fetch implementation found. Use Node.js 18+ or install 'node-fetch'.")
+  }
+})())
 const { spawn } = require('child_process')
 
 // 支持服务专用端口，避免与 webhook-receiver 共用 server/config.json 时发生端口冲突
@@ -76,7 +82,7 @@ async function supaFetch(path, opts = {}) {
   if (sendBearer) headers.Authorization = `Bearer ${SUPA_KEY}`
   try {
     console.log('supaFetch ->', url)
-    const resp = await fetch(url, Object.assign({}, opts, { headers }))
+    const resp = await fetchImpl(url, Object.assign({}, opts, { headers }))
     if (!resp.ok) {
       let txt = ''
       try { txt = await resp.text() } catch (e) { txt = `<unable to read body: ${e}>` }
@@ -220,7 +226,7 @@ async function start() {
   async function invokeCloudFuncForCid(funcUrl, token, pushCid, title, content, payload) {
     try {
       const body = { token: token || PUSH_TOKEN || null, push_clientid: pushCid, title: title || '', content: content || '', payload: payload || {} }
-      const resp = await fetch(funcUrl, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) })
+      const resp = await fetchImpl(funcUrl, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) })
       const txt = await resp.text().catch(() => '')
       let json
       try { json = JSON.parse(txt) } catch (e) { json = { statusText: txt } }