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/test/sources-identity/site-kinds.test.ts

@@ -138,6 +138,7 @@ describe.skipIf(!up)("站点类型:API、调度与 RSS", () => {
       kind: "public_bt",
       adapter: "api",
       snapshotEnabled: true,
+      proxy: true,
       searchDefault: false,
     });
     expect(nyaa.body.data.capabilities).toEqual(expect.arrayContaining(["search", "list"]));