Add salary currency field to Career resource and model, implement currency options, and update careers index view

database/migrations/2025_07_29_003040_add_salary_currency_to_careers_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('careers', function (Blueprint $table) {
+            $table->string('salary_currency')->nullable()->after('salary_per_month');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('careers', function (Blueprint $table) {
+            $table->dropColumn('salary_currency');
+        });
+    }
+};