feat(sources,organize): site agent capabilities and organize.minSizeBytes setting (W10-pre2)

- site.list / site.health_check / site.refresh_login / site.user_data capabilities
  over the W9-A site center services; outputs whitelisted (no secret refs,
  cookies, passwords, login names); execute kinds need automation grant.
  IDs use snake_case (CapabilityId regex); registry count 17 -> 21.
- settings.organize.minSizeBytes (default 50 MiB); file-manager identify /
  organize and planImport take request > setting > port default.
- tests and runbook notes (sites, files).

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

apps/server/test/e2e/e2-agent-delegate.test.ts

@@ -42,8 +42,8 @@ describe.skipIf(!hasPg)("E2 Agent 委托闭环(fake 模型 + 真实能力/授权
     return r.body.data.id as string;
   };
 
-  it("启动断言:17 个能力全部注册,并在能力目录里可见", async () => {
-    expect(e.booted.ctx.capabilities.list()).toHaveLength(17);
+  it("启动断言:21 个能力全部注册,并在能力目录里可见", async () => {
+    expect(e.booted.ctx.capabilities.list()).toHaveLength(21);
     const r = await e.api("GET", "/capabilities");
     expect(r.body.data.items.map((c: { id: string }) => c.id).sort()).toEqual(
       e.booted.ctx.capabilities