refactor: remove Cloudflare worker proxy implementation

cloudflare-worker.js

@@ -1,78 +0,0 @@
-addEventListener("fetch", (event) => {
-  event.respondWith(handleRequest(event.request));
-});
-
-const PROXY_SHARED_SECRET = "";
-const ALLOW_PROXY_ALL = false;
-const ALLOWED_TARGETS = [
-  "api.telegram.org",
-  "discord.com",
-  "discordapp.com",
-  "gateway.discord.gg",
-  "status.discord.com",
-  "slack.com",
-  "api.slack.com",
-  "web.whatsapp.com",
-  "graph.facebook.com",
-  "graph.instagram.com",
-  "api.openai.com",
-  "googleapis.com",
-  "google.com",
-  "googleusercontent.com",
-  "gstatic.com",
-];
-
-function isAllowedHost(hostname) {
-  const normalized = String(hostname || "").trim().toLowerCase();
-  if (!normalized) return false;
-  if (ALLOW_PROXY_ALL) return true;
-  return ALLOWED_TARGETS.some((domain) => normalized === domain || normalized.endsWith(`.${domain}`));
-}
-
-async function handleRequest(request) {
-  const url = new URL(request.url);
-  const queryTarget = url.searchParams.get("proxy_target");
-  const targetHost = request.headers.get("x-target-host") || queryTarget;
-  const telegramStylePath = url.pathname.startsWith("/bot") || url.pathname.startsWith("/file/bot");
-
-  if (PROXY_SHARED_SECRET) {
-    const providedSecret = request.headers.get("x-proxy-key") || url.searchParams.get("proxy_key") || "";
-    if (providedSecret !== PROXY_SHARED_SECRET && !(telegramStylePath && !targetHost)) {
-      return new Response("Unauthorized: Invalid proxy key", { status: 401 });
-    }
-  }
-
-  let targetBase = "";
-  if (targetHost) {
-    if (!isAllowedHost(targetHost)) {
-      return new Response(`Forbidden: Host ${targetHost} is not allowed.`, { status: 403 });
-    }
-    targetBase = `https://${targetHost}`;
-  } else if (telegramStylePath) {
-    targetBase = "https://api.telegram.org";
-  } else {
-    return new Response("Invalid request: No target host provided.", { status: 400 });
-  }
-
-  const cleanSearch = new URLSearchParams(url.search);
-  cleanSearch.delete("proxy_target");
-  cleanSearch.delete("proxy_key");
-  const searchStr = cleanSearch.toString();
-  const targetUrl = targetBase + url.pathname + (searchStr ? `?${searchStr}` : "");
-
-  const headers = new Headers(request.headers);
-  for (const header of ["cf-connecting-ip", "cf-ray", "cf-visitor", "host", "x-real-ip", "x-target-host", "x-proxy-key"]) {
-    headers.delete(header);
-  }
-
-  try {
-    return await fetch(new Request(targetUrl, {
-      method: request.method,
-      headers,
-      body: request.body,
-      redirect: "follow",
-    }));
-  } catch (error) {
-    return new Response(`Proxy Error: ${error.message}`, { status: 502 });
-  }
-}