feat(spa): add USE_SPA_UI cutover flag with legacy fallback
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# SPA cutover feature flag (`USE_SPA_UI`)
## Formål
`USE_SPA_UI` styrer om host/player UI routes serverer Angular SPA shell eller legacy Django templates.
## Miljø-toggle (uden kodeændring)
Sæt env var pr. miljø:
- `USE_SPA_UI=true` -> `/lobby/ui/host` og `/lobby/ui/player` returnerer SPA shell
- `USE_SPA_UI=false` (default) -> legacy template-flow bruges uændret
Backward compatibility under cutover:
- Hvis `USE_SPA_UI` ikke er sat, bruges `WPP_SPA_ENABLED` som fallback.
## Verifikation
- Flag OFF: `UiScreenTests.test_legacy_templates_are_used_when_spa_flag_is_off`
- Flag ON (host): `UiScreenTests.test_host_screen_can_render_angular_shell_when_feature_flag_enabled`
- Flag ON (player): `UiScreenTests.test_player_screen_can_render_angular_shell_when_feature_flag_enabled`