feat(subscriptions): 按 MP 收敛订阅默认值与表单

- 定时主动搜索默认关(DEFAULT_SEARCH_INTERVAL_HOURS = 0),新建 / 手动照常各搜一次,之后靠 RSS 与站点快照
- 多版本自动补全系统缺省改为关
- 表单:基础页 = 作品与范围、下载、洗版;收录版本、优先级、自动补全折叠到进阶页「多版本」
- 对照文档 §7.3 记录落实范围

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

apps/server/test/sources-identity/subscription-search.test.ts

@@ -55,7 +55,7 @@ describe.skipIf(!up)("订阅主动搜索与季总集数", () => {
 
   it("按标题在已开启站点搜索:结果 upsert 为 source_release(新结果发 release.observed),排下次搜索并入队订阅重评", async () => {
     const e = await entity("Dune");
-    const subId = await subscribe(e);
+    const subId = await subscribe(e, { params: JSON.stringify({ searchIntervalHours: 24 }) });
     const searches = () => mock.requests.filter((r) => r.path.includes("search=")).length;
     const before = searches();
     const r = await searchSubscription(h.rt, subId);