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/snapshot_distribution.sql

@@ -0,0 +1,16 @@
+-- File: snapshot_distribution.sql
+-- Shows the distribution of snapshots per URL (how many URLs have 1, 2, 3, etc. snapshots)
+-- Usage: \i misc/sql/snapshot_distribution.sql
+
+WITH counts AS (
+    SELECT url, COUNT(*) as snapshot_count
+    FROM snapshots
+    GROUP BY url
+)
+SELECT 
+    snapshot_count,
+    COUNT(*) as url_count,
+    ROUND(COUNT(*) * 100.0 / SUM(COUNT(*)) OVER (), 2) as percentage
+FROM counts
+GROUP BY snapshot_count
+ORDER BY snapshot_count;