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/tests/test_phase2.py

@@ -9,7 +9,7 @@ import pytest
 import requests
 
 BASE_URL = os.environ.get("REACT_APP_BACKEND_URL", "").rstrip("/")
-ADMIN_EMAIL = "admin@kino.local"
+ADMIN_EMAIL = "admin@streamhoard.local"
 ADMIN_PASSWORD = "kino-admin-2026"
 
 
@@ -36,7 +36,7 @@ def admin_headers(admin_token):
 @pytest.fixture(scope="module")
 def member(api):
     """Create a fresh member for profile-scoped tests."""
-    email = f"TEST_p2_{uuid.uuid4().hex[:8]}@kino.local"
+    email = f"TEST_p2_{uuid.uuid4().hex[:8]}@streamhoard.local"
     r = api.post(f"{BASE_URL}/api/auth/register",
                  json={"email": email, "password": "pass1234", "name": "P2 User"})
     assert r.status_code == 200
@@ -101,7 +101,7 @@ class TestProfiles:
 
     def test_cannot_delete_last_profile(self, api):
         # fresh user with single profile
-        email = f"TEST_solo_{uuid.uuid4().hex[:6]}@kino.local"
+        email = f"TEST_solo_{uuid.uuid4().hex[:6]}@streamhoard.local"
         d = api.post(f"{BASE_URL}/api/auth/register",
                      json={"email": email, "password": "pass1234", "name": "Solo"}).json()
         h = {"Authorization": f"Bearer {d['access_token']}"}