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

install.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Kino — one-line installer
+# StreamHoard — one-line installer
 #
 # Usage (interactive):
 #   curl -fsSL https://raw.githubusercontent.com/YOU/kino-media-server/main/install.sh | sudo bash
@@ -25,7 +25,7 @@ KINO_DIR="${KINO_DIR:-/opt/kino}"
 KINO_HTTP_PORT="${KINO_HTTP_PORT:-8080}"
 MEDIA_ROOT_HOST="${MEDIA_ROOT_HOST:-${KINO_DIR}/media}"
 DB_NAME="${DB_NAME:-kino}"
-ADMIN_EMAIL="${ADMIN_EMAIL:-admin@kino.local}"
+ADMIN_EMAIL="${ADMIN_EMAIL:-admin@streamhoard.local}"
 ADMIN_NAME="${ADMIN_NAME:-Admin}"
 ADMIN_PASSWORD="${ADMIN_PASSWORD:-}"
 JWT_SECRET="${JWT_SECRET:-}"
@@ -172,7 +172,7 @@ fi
 # ---------- Done ----------
 cat <<EOF
 
-$(c_grn '━━━ Kino is up ━━━')
+$(c_grn '━━━ StreamHoard is up ━━━')
 
   URL       : $(c_cyn "$URL")
   Admin     : $(c_cyn "$ADMIN_EMAIL")