Add user avatar system and fix WHOIS parsing/cron synchronization

- Add avatar upload with Gravatar fallback and initials
- Fix false "available" detection for registered domains
- Clean up WHOIS status parsing and server display
- Update cron job to sync all WHOIS fields
- Fix TLD cache and .me domain parsing issues

database/migrations/021_add_avatar_field.sql

@@ -0,0 +1,4 @@
+-- Add avatar field to users table
+-- This field will store the filename of the uploaded avatar image
+ALTER TABLE users 
+ADD COLUMN avatar VARCHAR(255) NULL AFTER full_name;