fix: update openboot user avatar URL in database

Migration 0009 initially ran with wrong avatar URL (github.com/openbootdev.png).
This corrective migration updates the existing openboot user record to use
the correct GitHub organization avatar (avatars.githubusercontent.com/u/258731499).

Author: fullstackjam

migrations/0010_fix_openboot_avatar.sql

@@ -0,0 +1,5 @@
+-- Fix openboot user avatar URL (correcting migration 0009)
+
+UPDATE users
+SET avatar_url = 'https://avatars.githubusercontent.com/u/258731499?v=4'
+WHERE id = 'openboot-official';