feat(world): add persistent citizen simulation with needs, jobs, and social features

- Adds Character model with survival needs (hunger, thirst, energy) and state machine
- Implements city:tick world ticker for offline progression every minute
- Adds city territory expansion and building construction system
- Introduces job economy, inventory, and transaction audit trail
- Adds social graph (friends, marriage, children) and character chat
- Implements admin approval workflow for new registrations
- Adds hospital admission system for traffic accidents
- Includes comprehensive feature tests and world seeders

database/migrations/2026_10_18_000500_create_relationships_table.php

@@ -0,0 +1,40 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Creates the "relationships" table.
+ *
+ * Social graph between characters: friends, spouses and parent-child links.
+ * For parent_child, character_a is the child and character_b is the parent.
+ */
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('relationships', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('character_a_id')->constrained('characters')->cascadeOnDelete();
+            $table->foreignId('character_b_id')->constrained('characters')->cascadeOnDelete();
+            $table->string('type', 30);
+            $table->string('status', 20)->default('pending');
+            $table->timestamps();
+
+            $table->unique(['character_a_id', 'character_b_id', 'type']);
+            $table->index(['character_b_id', 'type', 'status']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('relationships');
+    }
+};