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/config/database.php

@@ -0,0 +1,22 @@
+<?php
+// Copy this file to config.php and fill in your Hostinger MySQL credentials.
+// Never commit config.php to version control.
+
+define('DB_HOST', 'localhost');
+define('DB_NAME', 'u595523489_wndd');   // e.g. u123456789_winded
+define('DB_USER', 'u595523489_wnddusr');   // e.g. u123456789_winded
+define('DB_PASS', '@>fnr0E7eS');
+define('DB_CHARSET', 'utf8mb4');
+
+function db(): PDO {
+    static $pdo = null;
+    if ($pdo === null) {
+        $dsn = 'mysql:host=' . DB_HOST . ';dbname=' . DB_NAME . ';charset=' . DB_CHARSET;
+        $pdo = new PDO($dsn, DB_USER, DB_PASS, [
+            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
+            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+            PDO::ATTR_EMULATE_PREPARES   => false,
+        ]);
+    }
+    return $pdo;
+}