feat: Add CostCalculator module with CRUD functionality and frontend integration

- Created new module for CostCalculator with necessary routes and controllers.
- Implemented views for creating, editing, and displaying costs.
- Added form partials for cost input with validation.
- Integrated living status options in the form.
- Developed frontend logic for cost calculation steps with dynamic UI updates.
- Included necessary assets (JS and SCSS) for styling and functionality.
- Updated constants for living status options.
- Enhanced existing client-side cost calculator page with new features.

Modules/CostCalculator/app/Models/CostCalculator.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Modules\CostCalculator\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Modules\CCMS\Models\Country;
+use Modules\CourseFinder\Models\Program;
+use Modules\CourseFinder\Models\ProgramLevel;
+
+// use Modules\CostCalculator\Database\Factories\CostCalculatorFactory;
+
+class CostCalculator extends Model
+{
+    use HasFactory;
+    use \Staudenmeir\EloquentJsonRelations\HasJsonRelationships;
+
+    /**
+     * The attributes that are mass assignable.
+     */
+    protected $guarded = [];
+
+    protected $casts = [
+        'living_cost' => 'object',
+        'accomodation_cost' => 'object',
+        'onetime_cost' => 'object',
+        'other_services' => 'object',
+    ];
+
+    public function institution()
+    {
+        return $this->belongsTo(Country::class, 'country_id');
+    }
+
+    public function programLevel()
+    {
+        return $this->belongsTo(ProgramLevel::class, 'programlevel_id');
+    }
+
+    public function program()
+    {
+        return $this->belongsTo(Program::class, 'program_id');
+    }
+}