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

app/Models/Job.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * Employment position offered inside a city (table: job_positions).
+ *
+ * Characters hold at most one job; salaries accrue while state=working.
+ */
+#[Fillable(['city_id', 'store_id', 'title', 'salary', 'requires_education'])]
+class Job extends Model
+{
+    /**
+     * Eloquent table name (queue already owns "jobs".
+     *
+     * @var string
+     */
+    protected $table = 'job_positions';
+
+    /**
+     * City offering the position.
+     *
+     * @return BelongsTo<City, $this>
+     */
+    public function city(): BelongsTo
+    {
+        return $this->belongsTo(City::class);
+    }
+
+    /**
+     * Store providing the position, when commercial.
+     *
+     * @return BelongsTo<Store, $this>
+     */
+    public function store(): BelongsTo
+    {
+        return $this->belongsTo(Store::class);
+    }
+
+    /**
+     * Get the attributes that should be cast.
+     *
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'salary' => 'float',
+            'requires_education' => 'integer',
+        ];
+    }
+}