feat(cloud): P1-B scaffold — composer autoload + Config

cloud/.gitignore

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+/vendor/
+/config.php
+/storage/snapshots/*
+!/storage/snapshots/.gitkeep

cloud/composer.json

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+{
+  "name": "move-detect/cloud",
+  "type": "project",
+  "require": { "php": ">=8.2" },
+  "require-dev": { "phpunit/phpunit": "^11" },
+  "autoload": { "psr-4": { "App\\": "src/" } },
+  "autoload-dev": { "psr-4": { "App\\Tests\\": "tests/" } }
+}

cloud/config.example.php

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+<?php
+return [
+    'db_dsn'  => 'mysql:host=localhost;dbname=move_detect;charset=utf8mb4',
+    'db_user' => 'CHANGEME',
+    'db_pass' => 'CHANGEME',
+    'snapshot_dir' => __DIR__ . '/storage/snapshots',
+    'timestamp_window' => 300,
+    'rate_limit_per_min' => 60,
+];

cloud/phpunit.xml

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+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         bootstrap="vendor/autoload.php" colors="true">
+  <testsuites>
+    <testsuite name="unit"><directory>tests</directory></testsuite>
+  </testsuites>
+</phpunit>

cloud/src/Config.php

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+<?php
+declare(strict_types=1);
+namespace App;
+
+final class Config
+{
+    private function __construct(private array $a) {}
+
+    public static function fromArray(array $a): self { return new self($a); }
+
+    public function dbDsn(): string { return (string)($this->a['db_dsn'] ?? ''); }
+    public function dbUser(): string { return (string)($this->a['db_user'] ?? ''); }
+    public function dbPass(): string { return (string)($this->a['db_pass'] ?? ''); }
+    public function snapshotDir(): string { return (string)($this->a['snapshot_dir'] ?? __DIR__ . '/../storage/snapshots'); }
+    public function nonceTtl(): int { return (int)($this->a['nonce_ttl'] ?? 86400); }
+    public function timestampWindow(): int { return (int)($this->a['timestamp_window'] ?? 300); }
+    public function rateLimitPerMin(): int { return (int)($this->a['rate_limit_per_min'] ?? 60); }
+}

cloud/tests/ConfigTest.php

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+<?php
+declare(strict_types=1);
+namespace App\Tests;
+use App\Config;
+use PHPUnit\Framework\TestCase;
+
+final class ConfigTest extends TestCase
+{
+    public function testTypedGettersWithDefaults(): void
+    {
+        $c = Config::fromArray(['db_dsn' => 'sqlite::memory:']);
+        $this->assertSame('sqlite::memory:', $c->dbDsn());
+        $this->assertSame(300, $c->timestampWindow());
+        $this->assertSame(60, $c->rateLimitPerMin());
+        $this->assertSame(86400, $c->nonceTtl());
+    }
+
+    public function testOverrides(): void
+    {
+        $c = Config::fromArray(['db_dsn' => 'x', 'timestamp_window' => 120, 'rate_limit_per_min' => 30]);
+        $this->assertSame(120, $c->timestampWindow());
+        $this->assertSame(30, $c->rateLimitPerMin());
+    }
+}