fix(sites): 站点开代理但没填代理地址时沿用容器 HTTPS_PROXY;内置公开 BT 站默认开代理

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/src/egress.ts

@@ -72,14 +72,19 @@ export function fetchVia(client: Deno.HttpClient): typeof globalThis.fetch {
     globalThis.fetch(input, { ...init, client } as RequestInit)) as typeof globalThis.fetch;
 }
 
-/** 站点请求的出口:开代理且有代理地址 → proxy,否则 direct */
+/** 站点请求的出口:开代理 → 设置里的站点代理地址,没填则用进程的 HTTPS_PROXY / HTTP_PROXY;都没有 → direct */
 export interface SiteEgress {
   mode: "direct" | "proxy";
   proxyUrl: string | null;
 }
 
-export function siteEgress(proxy: boolean, proxyUrl: string | null | undefined): SiteEgress {
-  return proxy && proxyUrl ? { mode: "proxy", proxyUrl } : { mode: "direct", proxyUrl: null };
+export function siteEgress(
+  proxy: boolean,
+  proxyUrl: string | null | undefined,
+  env: Record<string, string | undefined> = ENV_SNAPSHOT,
+): SiteEgress {
+  const url = proxy ? proxyUrl || env.HTTPS_PROXY || env.https_proxy || env.HTTP_PROXY || env.http_proxy : null;
+  return url ? { mode: "proxy", proxyUrl: url } : { mode: "direct", proxyUrl: null };
 }
 
 /** 出口的比较键(不含代理口令):direct / proxy:<主机:端口> */