feat: add companies as top-level container for projects with departments

- Company → Project → (Locations + Departments) hierarchy
- Company CRUD (add, edit, delete) with AJAX
- Projects are created under a company via inline strip
- Two-column project body: Locations | Departments
- Stats show companies, projects, locations, departments, active projects
- Dynamic stat counters update on add/delete without page reload

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

database/migrations/2026_05_26_145521_create_settings_companies_and_add_company_id_to_projects.php

@@ -0,0 +1,41 @@
+<?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::create('settings_companies', function (Blueprint $table) {
+            $table->id();
+            $table->string('name', 255)->unique();
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+
+        Schema::table('settings_projects', function (Blueprint $table) {
+            $table->foreignId('company_id')->nullable()->after('id')
+                  ->constrained('settings_companies')->nullOnDelete();
+        });
+
+        // Assign all existing projects to a "General" company
+        if (\DB::table('settings_projects')->exists()) {
+            $id = \DB::table('settings_companies')->insertGetId(['name' => 'General', 'is_active' => 1, 'created_at' => now(), 'updated_at' => now()]);
+            \DB::table('settings_projects')->update(['company_id' => $id]);
+        }
+    }
+
+    public function down(): void
+    {
+        Schema::table('settings_projects', function (Blueprint $table) {
+            $table->dropForeign(['company_id']);
+            $table->dropColumn('company_id');
+        });
+        Schema::dropIfExists('settings_companies');
+    }
+};