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Turn the gated-off mock banner into a real advertising subsystem (backend + admin half; the UI rotation lands in PR2). - internal/ads: campaigns (percent weight + validity window; a perpetual, undeletable default that fills the remainder up to 100%), 1..N bilingual messages (en+ru), global display timings; ActiveSet computes the window-filtered, default-remainder, GCD-reduced, language-resolved rotation feed. Smooth-weighted-round-robin math is unit-tested. - migration 00006 (+ jetgen): ad_campaigns / ad_messages / ad_settings, seeded default campaign + house message + default timings. - eligibility = !paid_account && hint_balance==0 && !no_banner role (new role; guests qualify). The resolved feed rides the profile.get response (no new RPC, works for guests, nothing distinct to filter); language by service_language. - live update: a notify `banner` sub-kind (re-poll signal) published when an operator grants hints or grants/revokes no_banner, so the client shows/hides in place. - admin console /_gm/banners (+ /_gm/banner-settings): campaign + message CRUD with reorder, default protection, clamped timings. - wire: fbs BannerInfo/BannerCampaign on Profile; gateway transcode forwards it. - docs: ARCHITECTURE §10, FUNCTIONAL (+ _ru), backend README, PRERELEASE tracker (incl. the deferred app.load aggregator note).