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_000400_create_buildings_table.php

@@ -0,0 +1,46 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Creates the "buildings" table.
+ *
+ * Player-constructed structures (houses, etc.) placed on free terrain.
+ * Construction advances via the world ticker until is_complete.
+ */
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('buildings', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('city_id')->constrained('cities')->cascadeOnDelete();
+            $table->foreignId('owner_character_id')->nullable()->constrained('characters')->nullOnDelete();
+            $table->string('type', 40)->default('house');
+            $table->string('name', 160)->nullable();
+            $table->decimal('pos_x', 10, 2);
+            $table->decimal('pos_z', 10, 2);
+            $table->decimal('width', 8, 2)->default(10);
+            $table->decimal('depth', 8, 2)->default(10);
+            $table->decimal('height', 8, 2)->default(5);
+            $table->boolean('is_complete')->default(false)->index();
+            $table->unsignedTinyInteger('build_progress')->default(0);
+            $table->timestamps();
+
+            $table->index(['city_id', 'type']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('buildings');
+    }
+};