Polymarket Click Beacon

Fire-and-forget click beacon from the FE Polymarket bet-card.

Accepts {click_id?, embedder_slug?, event?} and persists a zero- amount click :class:EmbedderRevenueEvent attributed to the embedder (so the affiliate roll-up can build a click→deposit funnel without a second table — same shape the embed click-broker uses).

Best-effort discipline (matches the rest of the affiliate surface):

• Unknown / omitted embedder slug → fall back to the house embedder if one exists, else log-only (no DB row) and still 200. We never 500 a beacon.
• Replay within the same UTC day → IntegrityError on the dub_event_id UNIQUE constraint → rollback + NOOP, still 200.
• Any other persist failure → rollback + log, still 200.

Intentionally NOT FF-gated: POLYMARKET_AFFILIATE_ENABLED only controls whether :func:polymarket_affiliate_link mints an attributed URL; if the operator temporarily flips it off we still want to log the clicks the card is sending so we don't lose tracking on a transient disable.