auth urls: mount apps.lyric.urls under /dashboard/ to mirror gameboard/epic & billboard/drama convention

- core/urls.py: replace `path('lyric/', …)` with second `path('dashboard/', include('apps.lyric.urls'))` alongside existing dashboard mount; no path-name collision (lyric paths: send_login_email, login, logout, dev-login/<key>/)
- IT test URL strings flipped /lyric/ → /dashboard/ (test_views.py)
- setup_sig_session + setup_sea_session pre-auth URL builders updated
- CLAUDE.md doc note updated
- Templates use unnamespaced `{% url 'logout' %}` / `{% url 'send_login_email' %}` so they auto-resolve; no template edits needed
- /admin/lyric/user/ admin URL untouched (driven by app_label, not URL conf)

Code architected by Disco DeDisco <discodedisco@outlook.com>
Git commit message Co-Authored-By:
Claude Sonnet 4.6 <noreply@anthropic.com>

src/core/urls.py

@@ -11,7 +11,7 @@ urlpatterns = [
     path('', dash_views.home_page, name='home'),
     path('api/', include('apps.api.urls')),
     path('dashboard/', include('apps.dashboard.urls')),
-    path('lyric/', include('apps.lyric.urls')),
+    path('dashboard/', include('apps.lyric.urls')),
     path('gameboard/', include('apps.gameboard.urls')),
     path('gameboard/', include('apps.epic.urls')),
     path('billboard/', include('apps.billboard.urls')),