Enhance crawler with seed list and SQL utilities

Add seedList module for URL initialization, comprehensive SQL utilities for database analysis, and update project configuration.

misc/sql/crawl_top_level.sql

@@ -0,0 +1,30 @@
+BEGIN;
+
+WITH matching_urls AS (
+    SELECT url, host
+    FROM snapshots
+    WHERE url ~ '^gemini://[^/]+/$'
+      AND timestamp < (NOW() - INTERVAL '1 week')
+    ORDER BY random()
+    LIMIT 500
+)
+INSERT INTO urls (url, host)
+SELECT url, host
+FROM matching_urls
+ON CONFLICT DO NOTHING;
+
+-- WITH matching_urls AS (
+--     SELECT url, host
+--     FROM snapshots
+--     WHERE url ~ '^gemini://[^/]+/$'
+--       AND timestamp < (NOW() - INTERVAL '1 week')
+--     ORDER BY random()
+--     LIMIT 500
+-- )
+-- DELETE FROM snapshots
+-- WHERE url IN (
+--     SELECT url
+--     FROM matching_urls
+-- );
+
+COMMIT;