Add Strike ticker poller, Docker .env config, and Frankfurter retry logic

- Poll Strike API every 10s, store all rates as JSONB in strike_price table
- Move Docker env vars to .env file, use shared network for cross-project communication
- Add startup retry (5x 5s) for Frankfurter poller to handle container race condition

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/queries.sql

@@ -42,3 +42,11 @@ SET open = EXCLUDED.open,
 -- :name get-latest-kraken-day :? :1
 -- :doc Get the most recent Kraken daily candle by timestamp
 SELECT ts FROM kraken_day ORDER BY ts DESC LIMIT 1
+
+-- :name insert-strike-price! :! :n
+-- :doc Insert a Strike ticker snapshot
+INSERT INTO strike_price (rates) VALUES (:rates)
+
+-- :name get-latest-strike-price :? :1
+-- :doc Get the most recent Strike ticker snapshot
+SELECT rates, recorded_at FROM strike_price ORDER BY id DESC LIMIT 1