feat: add internship date fields and business day calculation to career applications

database/migrations/2026_06_01_045933_add_internship_dates_to_career_applications_table.php

@@ -0,0 +1,30 @@
+<?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('career_applications', function (Blueprint $table) {
+            $table->date('internship_start_date')->nullable()->after('to_be_signed_internship_form_path');
+            $table->date('internship_end_date')->nullable()->after('internship_start_date');
+            $table->integer('internship_total_days')->nullable()->after('internship_end_date');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('career_applications', function (Blueprint $table) {
+            $table->dropColumn(['internship_start_date', 'internship_end_date', 'internship_total_days']);
+        });
+    }
+};