Gate consistency video to members; embed on rhythm page; add vertical cut

- Members-only: the stay-consistent video now requires a wallet-verified session
  (server 403 + training-page lock UI), matching Module 3.
- Embedded on /weekly-rhythm above the sheet (hidden in print) with a members-only
  fallback card for signed-out visitors.
- Added a ~31s vertical (1080x1920) social cut, ungated, for Telegram/social.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server.js

@@ -1616,7 +1616,7 @@ const server=http.createServer(async(req,res)=>{
     // member session (web sign-in or the Mini App auth bridge). Lesson 1, all
     // posters, and every join-funnel/transparency video stay public on purpose:
     // Lesson 1 is the free preview, the rest is the trust engine.
-    if((/^\/v\/rmc-method-m\d+l\d+-[0-9a-f]+\.mp4$/.test(pathname)&&!/^\/v\/rmc-method-m1l1-/.test(pathname))||pathname==='/training/egift_cards.mp4'){
+    if((/^\/v\/rmc-method-m\d+l\d+-[0-9a-f]+\.mp4$/.test(pathname)&&!/^\/v\/rmc-method-m1l1-/.test(pathname))||/^\/v\/rmc-stay-consistent-[0-9a-f]+\.mp4$/.test(pathname)||pathname==='/training/egift_cards.mp4'){
       if(!messages.authFromCookie(req))return json(res,403,{error:'Members area — sign in on the training page with the wallet that owns your position, or open it through the Telegram Mini App.'},{'Cache-Control':'no-store'});
     }
     if(pathname==='/unsubscribe'){