feat(announcement): swap the launch modal to Comfy Router

[deepme987]

What

Points the Desktop launch-announcement modal (the title-bar news bell) at the Comfy Router launch, the same way #1480 did for Comfy Cloud nodes. Reuses AnnouncementModal.vue by swapping the id, copy, URLs and i18n namespace, which is exactly what its header comment asks for rather than adding a second component.

Copy is Steven's finalized in-app version (the Comfy Router Launch Emails / In-App doc): a subhead plus three benefit bullets, restructured onto the modal's checklist layout instead of one dense paragraph.

changed	to
ANNOUNCEMENT_ID	comfy_cloud_nodes → comfy_router
CTA	two buttons (Read More + docs) → single Learn About Comfy Router → comfy.org/platform/router
hero media	Cloud nodes film → media.comfy.org/website/router/hero_v1.{mp4,webp}
UTM campaign	comfy_cloud_nodes → comfy_router
i18n namespace	announcement.cloudNodes.* → announcement.comfyRouter.*
seen-flag	cloudNodesAnnouncementSeen → new comfyRouterAnnouncementSeen

Review focus

• Hero asset is not uploaded yet. media.comfy.org/website/router/hero_v1.{mp4,webp} 404s today, so the modal falls back to the .announce-media gradient. The asset is being uploaded separately; do not merge/ship until it is live. Pointing at the final path now means that is a pure upload, no follow-up code change.
• New seen-flag re-lights the bell. comfyRouterAnnouncementSeen is a new key so anyone who dismissed the Cloud nodes announcement still gets this one. The old cloudNodesAnnouncementSeen (and minimaxAnnouncementSeen) stay defined in the schema, since they are already persisted on users' machines.
• Single CTA, no beta note. Router copy is one button, so the docs ghost button and the beta fine-print line the Cloud nodes modal carried are gone. The Cloud nodes copy block is left untouched in both locales, so reverting is a one-line namespace change.
• zh strings are machine-written, no native review yet, consistent with how the MiniMax and Cloud nodes strings landed. Both locale edits are additions-only; zh.json keeps its \uXXXX escapes so the diff does not re-serialise the file.

Testing

• pnpm run typecheck clean across all four projects (node, web, e2e, integration); eslint and prettier --check clean (also enforced by the pre-commit hook).
• pnpm dev builds main/preload/renderer and launches; the modal was reviewed in the running app via the title-bar bell (title, subhead, three checkmark bullets, single CTA, sound toggle).
• Verified every announcement.comfyRouter.* key the template references resolves in both en and zh (7/7 keys, 3/3 highlights).

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