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/snapshots_per_url.sql

@@ -0,0 +1,8 @@
+-- File: snapshots_per_url.sql
+-- Basic count of snapshots per URL
+-- Usage: \i misc/sql/snapshots_per_url.sql
+
+SELECT url, COUNT(*) as snapshot_count
+FROM snapshots
+GROUP BY url
+ORDER BY snapshot_count DESC;