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_000300_create_characters_table.php

@@ -0,0 +1,55 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Creates the "characters" table.
+ *
+ * A character is the in-world avatar of a user (user_id nullable for NPC
+ * children). It stores position, survival needs, employment and family-relevant
+ * state that the world ticker updates continuously.
+ */
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('characters', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('user_id')->nullable()->unique()->constrained('users')->nullOnDelete();
+            $table->foreignId('city_id')->constrained('cities')->cascadeOnDelete();
+            $table->string('name', 120);
+            $table->unsignedTinyInteger('skin')->default(1);
+            $table->unsignedTinyInteger('hair')->default(1);
+            $table->unsignedTinyInteger('shirt')->default(1);
+            $table->decimal('pos_x', 10, 2)->default(0);
+            $table->decimal('pos_y', 10, 2)->default(0);
+            $table->decimal('pos_z', 10, 2)->default(0);
+            $table->decimal('money', 12, 2)->default(100);
+            $table->unsignedTinyInteger('energy')->default(100);
+            $table->unsignedTinyInteger('hunger')->default(100);
+            $table->unsignedTinyInteger('thirst')->default(100);
+            $table->string('state', 20)->default('awake')->index();
+            $table->foreignId('job_id')->nullable()->constrained('job_positions')->nullOnDelete();
+            $table->foreignId('house_id')->nullable();
+            $table->unsignedTinyInteger('education')->default(0);
+            $table->boolean('is_online')->default(false);
+            $table->timestamp('last_tick_at')->nullable();
+            $table->timestamps();
+
+            $table->index(['city_id', 'state']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('characters');
+    }
+};