feat: add reciprocal user blocking

database/migrations/2026_08_11_135119_create_user_blocks_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('user_blocks', function (Blueprint $table) {
+            $table->id();
+            $table->foreignUlid('blocker_id')->constrained('users')->cascadeOnDelete();
+            $table->foreignUlid('blocked_id')->constrained('users')->cascadeOnDelete();
+            $table->timestamps();
+
+            $table->unique(['blocker_id', 'blocked_id']);
+            $table->index(['blocked_id', 'blocker_id']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('user_blocks');
+    }
+};