Add public API v1 with API key auth, rate limiting, and docs page

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

app/Policies/ApiKeyPolicy.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\ApiKey;
+use App\Models\User;
+
+class ApiKeyPolicy
+{
+    public function delete(User $user, ApiKey $apiKey): bool
+    {
+        return $user->id === $apiKey->user_id;
+    }
+}