fix: add channel status filtering (#80706)

Summary:
- Add `openclaw channels status --channel <name>` filtering through CLI, gateway protocol, and fallback status rendering.
- Document the BlueBubbles-to-iMessage cutover path so operators can probe iMessage without starting both monitors.
- Refresh generated Swift protocol model for the new optional channel status parameter.

Verification:
- `pnpm test src/gateway/server-methods/channels.status.test.ts src/commands/channels.status.command-flow.test.ts src/cli/program/routes.test.ts -- --reporter=verbose`
- `CI=true pnpm check:docs`
- `pnpm protocol:check`
- `git diff --check`
- `node scripts/check-changelog-attributions.mjs`
- CI head `45b27e3866`: focused/docs/protocol shards green locally; GitHub broad/scanner jobs queued for runners at merge attempt time; `Real behavior proof` failure is the maintainer-ignorable external-real-proof complaint.

src/cli/program/route-args.ts

@@ -257,10 +257,15 @@ export function parseChannelsListRouteArgs(argv: string[]) {
 
 export function parseChannelsStatusRouteArgs(argv: string[]) {
   const timeout = parseOptionalFlagValue(argv, "--timeout");
+  const channel = parseOptionalFlagValue(argv, "--channel");
   if (!timeout.ok) {
     return null;
   }
+  if (!channel.ok) {
+    return null;
+  }
   return {
+    channel: channel.value,
     json: hasFlag(argv, "--json"),
     probe: hasFlag(argv, "--probe"),
     timeout: timeout.value,

src/cli/program/routes.test.ts

@@ -138,12 +138,14 @@ describe("program routes", () => {
         "status",
         "--json",
         "--probe",
+        "--channel",
+        "imsg",
         "--timeout",
         "5000",
       ]),
     ).resolves.toBe(true);
     expect(channelsStatusCommandMock).toHaveBeenCalledWith(
-      { json: true, probe: true, timeout: "5000" },
+      { channel: "imsg", json: true, probe: true, timeout: "5000" },
       defaultRuntime,
     );
   });