Initial commit: Flutter app + PHP/MySQL backend on Hostinger

Replaces Firebase with a self-hosted PHP/MySQL API served from
winded.prymsolutions.com. Includes full backend (schema, auth, events,
teams, brackets, suggestions, stats, media, file upload) and updated
Flutter repositories and domain models.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/api/.htaccess

@@ -0,0 +1,3 @@
+Header always set Access-Control-Allow-Origin "*"
+Header always set Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
+Header always set Access-Control-Allow-Headers "Content-Type, Authorization"