feat: build licensed desktop image processor

electron/main/server-api-headers.ts

@@ -0,0 +1,15 @@
+const DESKTOP_CLIENT_ID = 'genuine-qingquwang'
+const VISIBLE_ASCII = /^[\x20-\x7E]+$/
+
+export function buildDesktopRequestHeaders(version: string): Record<string, string> {
+  const clientHeader = `${DESKTOP_CLIENT_ID}/${version}`
+  // Fetch 请求头必须是 ByteString，禁止中文等非 ASCII 字符在发请求前触发异常。
+  if (!VISIBLE_ASCII.test(clientHeader)) {
+    throw new Error('桌面客户端版本标识必须使用 ASCII 字符')
+  }
+  return {
+    Accept: 'application/json',
+    'Content-Type': 'application/json',
+    'X-Desktop-Client': clientHeader,
+  }
+}