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/auth/register.php

@@ -0,0 +1,44 @@
+<?php
+require_once __DIR__ . '/../config/helpers.php';
+cors();
+
+if ($_SERVER['REQUEST_METHOD'] !== 'POST') json_err('Method not allowed', 405);
+
+$b = body();
+$email       = trim($b['email'] ?? '');
+$password    = $b['password'] ?? '';
+$displayName = trim($b['display_name'] ?? '');
+
+if (!filter_var($email, FILTER_VALIDATE_EMAIL)) json_err('Invalid email');
+if (strlen($password) < 6) json_err('Password must be at least 6 characters');
+
+$db = db();
+
+$stmt = $db->prepare('SELECT id FROM users WHERE email = ?');
+$stmt->execute([$email]);
+if ($stmt->fetch()) json_err('Email already registered', 409);
+
+$id   = uuid();
+$hash = password_hash($password, PASSWORD_BCRYPT);
+$role = resolve_role($email, 'player');
+
+$db->prepare(
+    'INSERT INTO users (id, email, password_hash, display_name, role) VALUES (?, ?, ?, ?, ?)'
+)->execute([$id, $email, $hash, $displayName, $role]);
+
+$token = JWT::encode(['uid' => $id, 'email' => $email, 'role' => $role]);
+
+json_ok([
+    'token' => $token,
+    'user'  => [
+        'id'           => $id,
+        'email'        => $email,
+        'display_name' => $displayName,
+        'role'         => $role,
+        'bio'          => '',
+        'photo_url'    => null,
+        'position'     => null,
+        'team_id'      => null,
+        'created_at'   => date('c'),
+    ],
+], 201);