Consolidate API root to /api/ path, remove duplicate endpoint at /

[Copilot]

The URL configuration served two API roots: a custom api_root_codespace at / with hardcoded URLs, and the DefaultRouter's root at /api/. This contradicted all documentation and client code which exclusively use /api/.

Changes

• Removed custom api_root_codespace function: Eliminated 30+ lines of redundant URL construction
• Switched to SimpleRouter: Prevents automatic root view creation that would conflict with custom root
• Moved views.api_root to /api/: Single API entry point using DRF's reverse() for environment-agnostic URLs
• Preserved api-root named route: Maintains compatibility with existing test suite

URL Resolution

urlpatterns = [
    path('admin/', admin.site.urls),
    # Exact match for /api/ only
    path('api/', views.api_root, name='api-root'),
    # Handles /api/users/, /api/teams/, etc.
    path('api/', include(router.urls)),
]

The / path is now available for future landing page or redirect. All API operations consistently use /api/ as base.

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