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/storage_efficiency.sql

@@ -0,0 +1,20 @@
+-- File: storage_efficiency.sql
+-- Shows potential storage savings from deduplication
+-- Usage: \i misc/sql/storage_efficiency.sql
+
+WITH duplicate_stats AS (
+    SELECT 
+        url,
+        COUNT(*) as snapshot_count,
+        COUNT(DISTINCT gemtext) as unique_gemtexts,
+        COUNT(DISTINCT data) as unique_datas
+    FROM snapshots
+    GROUP BY url
+    HAVING COUNT(*) > 1
+)
+SELECT 
+    SUM(snapshot_count) as total_snapshots,
+    SUM(unique_gemtexts + unique_datas) as unique_contents,
+    SUM(snapshot_count) - SUM(unique_gemtexts + unique_datas) as duplicate_content_count,
+    ROUND((SUM(snapshot_count) - SUM(unique_gemtexts + unique_datas)) * 100.0 / SUM(snapshot_count), 2) as duplicate_percentage
+FROM duplicate_stats;