fix(api): validate token team context

app/Http/Middleware/EnsureTokenBelongsToCurrentTeamMember.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class EnsureTokenBelongsToCurrentTeamMember
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $user = $request->user();
+        $token = $user?->currentAccessToken();
+        $teamId = $token?->team_id;
+
+        if (! $user || ! $token || is_null($teamId)) {
+            return response()->json(['message' => 'Invalid token.'], 401);
+        }
+
+        $team = $user->teams()
+            ->where('teams.id', $teamId)
+            ->first();
+
+        if (! $team) {
+            return response()->json(['message' => 'Invalid token.'], 401);
+        }
+
+        $role = $team->pivot?->role;
+        if (($token->can('root') || $token->can('write') || $token->can('write:sensitive'))
+            && ! in_array($role, ['admin', 'owner'], true)) {
+            return response()->json(['message' => 'Missing required team role.'], 403);
+        }
+
+        return $next($request);
+    }
+}