feat: move departments from projects to companies

Departments now belong to a Company, not a Project.
- New migration: recreates settings_departments with company_id (migrates existing data)
- Department model: company_id FK, company() relation
- Company model: departments() hasMany relation
- ProjectSetting model: removes departments() relation
- Controller: dept methods now take Company instead of ProjectSetting
- Routes: department CRUD moves to companies/{company}/departments
- View: departments section appears on each company card (purple theme);
  project body is now locations-only (single column)

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

database/migrations/2026_05_26_152123_move_departments_from_projects_to_companies.php

@@ -0,0 +1,47 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // Recreate table with company_id instead of project_id (SQLite-safe)
+        Schema::create('settings_departments_new', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('company_id')->constrained('settings_companies')->onDelete('cascade');
+            $table->string('name');
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+
+        // Migrate: map each department's project_id → that project's company_id
+        DB::statement('
+            INSERT INTO settings_departments_new (id, company_id, name, is_active, created_at, updated_at)
+            SELECT d.id, p.company_id, d.name, d.is_active, d.created_at, d.updated_at
+            FROM settings_departments d
+            LEFT JOIN settings_projects p ON p.id = d.project_id
+            WHERE p.company_id IS NOT NULL
+        ');
+
+        Schema::drop('settings_departments');
+        Schema::rename('settings_departments_new', 'settings_departments');
+    }
+
+    public function down(): void
+    {
+        Schema::create('settings_departments_old', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('project_id')->constrained('settings_projects')->onDelete('cascade');
+            $table->string('name');
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+
+        Schema::drop('settings_departments');
+        Schema::rename('settings_departments_old', 'settings_departments');
+    }
+};