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/upload/index.php

@@ -0,0 +1,34 @@
+<?php
+require_once __DIR__ . '/../config/helpers.php';
+cors();
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') json_err('Method not allowed', 405);
+
+require_auth();
+
+$file     = $_FILES['file'] ?? null;
+$context  = $_POST['context'] ?? 'general'; // e.g. 'avatar', 'team_logo'
+
+if (!$file || $file['error'] !== UPLOAD_ERR_OK) json_err('No file uploaded');
+
+$allowed = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'];
+$mime    = mime_content_type($file['tmp_name']);
+if (!in_array($mime, $allowed)) json_err('Only JPEG, PNG, GIF, and WebP images are allowed');
+
+$maxBytes = 5 * 1024 * 1024; // 5 MB
+if ($file['size'] > $maxBytes) json_err('File exceeds 5 MB limit');
+
+$ext      = pathinfo($file['name'], PATHINFO_EXTENSION);
+$filename = uuid() . '.' . strtolower($ext);
+$uploadDir= __DIR__ . '/../../uploads/' . $context . '/';
+
+if (!is_dir($uploadDir)) mkdir($uploadDir, 0755, true);
+
+$dest = $uploadDir . $filename;
+if (!move_uploaded_file($file['tmp_name'], $dest)) json_err('Upload failed', 500);
+
+// Build public URL — adjust the base URL to match your Hostinger domain.
+$baseUrl = (isset($_SERVER['HTTPS']) ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'];
+$url     = $baseUrl . '/uploads/' . $context . '/' . $filename;
+
+json_ok(['url' => $url]);