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

public/assets/uploads/.htaccess

@@ -0,0 +1,14 @@
+# Protect uploads directory
+Options -Indexes
+
+# Allow only image files
+<FilesMatch "\.(jpg|jpeg|png|gif|webp)$">
+    Order Allow,Deny
+    Allow from all
+</FilesMatch>
+
+# Deny all other file types
+<FilesMatch "^(?!.*\.(jpg|jpeg|png|gif|webp)$).*$">
+    Order Deny,Allow
+    Deny from all
+</FilesMatch>