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

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

app/Http/Middleware/AuthenticateApiKey.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Models\ApiKey;
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class AuthenticateApiKey
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $key = $request->bearerToken() ?? $request->get('api_key');
+
+        if (! $key) {
+            return response()->json(['error' => 'Invalid API key'], 401);
+        }
+
+        $apiKey = ApiKey::where('key', $key)->with('user')->first();
+
+        if (! $apiKey) {
+            return response()->json(['error' => 'Invalid API key'], 401);
+        }
+
+        auth()->login($apiKey->user);
+        $apiKey->update(['last_used_at' => now()]);
+
+        return $next($request);
+    }
+}