7f1dffad80
Add PostHog opt-in/opt-out consent support mirroring the existing Google Consent Mode integration: database column, GraphQL field, console UI toggle, and client-side posthog-js calls. Extract both GCM and PostHog logic from CookieBannerClient into a ConsentIntegration plugin interface so future integrations can be added without modifying the client core. Signed-off-by: Émile Ré <emile@getprobo.com>