docs(modpackchecker): Fix namespace in README, add icon to file structure

- Changed troubleshooting namespace to Pterodactyl\Http\Controllers
- Added icon.png to file structure documentation

Signed-off-by: Claude (Chronicler #63) <claude@firefrostgaming.com>

services/modpack-version-checker/blueprint-extension/README.md

@@ -118,6 +118,7 @@ blueprint-extension/
 ├── README.md                    # This file
 ├── conf.yml                     # Blueprint configuration
 ├── build.sh                     # Injection script (runs during blueprint -build)
+├── icon.png                     # Extension icon (128x128, Gemini-designed)
 │
 ├── app/                         # Merges into Pterodactyl's app/ via requests.app
 │   ├── Console/
@@ -340,7 +341,7 @@ Get cached status for all servers accessible to the authenticated user.
 
 ### 500 errors on check
 1. Check PHP error log: `tail -f /var/log/php8.3-fpm.log`
-2. Verify controller namespace: `Pterodactyl\BlueprintFramework\Extensions\modpackchecker\Controllers`
+2. Verify controller namespace: `Pterodactyl\Http\Controllers`
 3. Restart PHP-FPM: `systemctl restart php8.3-fpm`
 
 ### Build.sh not running