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

backend/server.py

@@ -57,7 +57,7 @@ for d in (VIDEOS_DIR, POSTERS_DIR, SUBS_DIR, HLS_DIR):
 
 CHUNK_SIZE = 1024 * 1024
 
-app = FastAPI(title="Kino")
+app = FastAPI(title="StreamHoard")
 api = APIRouter(prefix="/api")
 bearer = HTTPBearer(auto_error=False)
 
@@ -114,7 +114,7 @@ async def on_startup():
     await db.profiles.create_index("user_id")
     await db.subtitles.create_index("movie_id")
 
-    admin_email = os.environ.get("ADMIN_EMAIL", "admin@kino.local")
+    admin_email = os.environ.get("ADMIN_EMAIL", "admin@streamhoard.local")
     if not await db.users.find_one({"email": admin_email}):
         admin_user = {
             "id": str(uuid.uuid4()),
@@ -1482,7 +1482,7 @@ async def _auto_fetch_subtitle(content_type: str, content_id: str, tmdb_id: Opti
 # ============ HEALTH ============
 @api.get("/")
 async def root():
-    return {"app": "Kino", "status": "ok"}
+    return {"app": "StreamHoard", "status": "ok"}
 
 
 app.include_router(api)