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/modules/sources-identity/routes/sources.ts

@@ -184,7 +184,8 @@ export function sourcesRoutes(app: ModuleApp, rt: () => SourcesRuntime) {
               snapshot_enabled:
                 kind === "pt" ? (body.snapshotEnabled ?? false) : publicDef ? (body.snapshotEnabled ?? true) : false,
               snapshot_interval_sec: body.snapshotIntervalSec ?? null,
-              proxy: body.proxy ?? false,
+              // 内置公开 BT 站(Nyaa 等)国内多数直连不通:默认走代理
+              proxy: body.proxy ?? !!publicDef,
               // 不能搜索的站点不进默认搜索集合
               search_default:
                 kind === "pt" ? (body.searchDefault ?? true) : publicDef ? (body.searchDefault ?? false) : false,