fix: retarget orphan changeset from manifest-model-router to manifest

The release workflow was failing again with:

  🦋 error Found changeset remove-local-mode for package
    manifest-model-router which is not in the workspace

.changeset/remove-local-mode.md was added in #1539 but targets
manifest-model-router, which was deleted in #1528. Changesets
fast-fails on any dangling package reference.

The changeset content itself is genuinely useful — it documents the
local-mode removal, the Docker hardening, the new AUTO_MIGRATE env
var, and the unified EMAIL_* scheme. Rather than deleting it (which
is what #1534 did for a similar situation), retarget it to 'manifest'
so the content lands in packages/manifest/CHANGELOG.md on the next
release.

Also drop the now-stale final sentence that described
manifest-model-router as 'the recommended way to route OpenClaw
requests through Manifest' — that package no longer exists. Replaced
with a correct note pointing users at configuring Manifest as a
generic OpenAI-compatible provider (which is what the dashboard
setup modal shows them).

Author: brunobuddy

.changeset/remove-local-mode.md

@@ -1,5 +1,5 @@
 ---
-"manifest-model-router": patch
+"manifest": patch
 ---
 
 Remove local mode and harden the Docker deployment.
@@ -10,4 +10,4 @@ Docker deployments now default to `NODE_ENV=production`, with migrations control
 
 New unified `EMAIL_*` env var scheme (`EMAIL_PROVIDER`, `EMAIL_API_KEY`, `EMAIL_DOMAIN`, `EMAIL_FROM`) covers both Better Auth transactional emails (signup verification, password reset) and threshold alert notifications. Supports Resend (recommended for self-hosting — no domain setup), Mailgun, and SendGrid. Legacy `MAILGUN_*` env vars still work for backward compatibility.
 
-Breaking: `MANIFEST_MODE`, `MANIFEST_DB_PATH`, `MANIFEST_UPDATE_CHECK_OPTOUT`, `MANIFEST_TRUST_LAN` env vars are removed (no-op if set). The `manifest` npm package is deprecated. The `manifest-model-router` plugin is unaffected and remains the recommended way to route OpenClaw requests through Manifest.
+Breaking: `MANIFEST_MODE`, `MANIFEST_DB_PATH`, `MANIFEST_UPDATE_CHECK_OPTOUT`, `MANIFEST_TRUST_LAN` env vars are removed (no-op if set). Both the `manifest` and `manifest-model-router` npm packages are deprecated — OpenClaw users should configure Manifest as a generic OpenAI-compatible provider instead (see the setup modal in the dashboard).