Rebrand StreamHoard, strip Emergent.sh platform artifacts

- Remove .emergent/ state dir, tracked .gitconfig, @emergentbase/visual-edits
  dep + craco wiring, emergent.sh script/meta tags, PostHog telemetry snippet
- Rename UI/docs branding Kino -> StreamHoard (README, DEPLOY.md, Navbar,
  Login, Register, AdminShowEpisodes, FastAPI title, health check response)
- Rename docker-compose container/network names to streamhoard-*
- Default admin email domain -> admin@streamhoard.local

README.md

@@ -1,4 +1,4 @@
-# Kino — Personal Media Server (Netflix Clone)
+# StreamHoard — Personal Media Server (Netflix Clone)
 
 A self-hosted Netflix-style streaming app for movies you legally own.
 Built with FastAPI + React + MongoDB.
@@ -41,7 +41,7 @@ See **[DEPLOY.md](./DEPLOY.md)** for LAMP-coexistence, Apache reverse proxy, Rad
   *(Legal alternative to auto-downloading — auto-download of copyrighted material is not implemented.)*
 
 ## Default admin
-- Email: `admin@kino.local`
+- Email: `admin@streamhoard.local`
 - Password: `kino-admin-2026`
 
 Change `ADMIN_EMAIL` / `ADMIN_PASSWORD` in `backend/.env` before first start
@@ -118,7 +118,7 @@ Movie media files should live on your Proxmox storage, not Git.
 # Login
 curl -X POST $URL/api/auth/login \
   -H 'Content-Type: application/json' \
-  -d '{"email":"admin@kino.local","password":"kino-admin-2026"}'
+  -d '{"email":"admin@streamhoard.local","password":"kino-admin-2026"}'
 
 # List movies
 curl $URL/api/movies
@@ -130,7 +130,7 @@ curl $URL/api/stream/<movie_id>?auth=<token>
 ## Why no auto-download?
 
 Auto-downloading copyrighted movies from the internet is illegal in most
-jurisdictions (DMCA, EU copyright directive, etc.). Kino is built as a
+jurisdictions (DMCA, EU copyright directive, etc.). StreamHoard is built as a
 **personal media server** for content you legally own or that is in the
 public domain (Internet Archive, Blender Open Movies, etc.).