feat: complete Epic 1 — team management & permission system

- Story 1.1: Permission enum, config, AuthorizesPermissions & HasWorkspaceScope traits, member→worker migration
- Story 1.2: Team page with member list, invitation system with queued email
- Story 1.3: Role assignment (Manager/Worker) and member removal with activity logging
- Story 1.4: Owner-only permission toggle matrix for Managers (manage team, view logs, configure portal)
- Story 1.5: Role-based access enforcement — Workers see only assigned declarations/clients, sidebar scoping
- Story 1.6: Workspace switcher dropdown for multi-workspace users with session-based switching
- 83 new/modified files, 182 tests passing with zero regressions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Requests/SwitchWorkspaceRequest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Foundation\Http\FormRequest;
+
+class SwitchWorkspaceRequest extends FormRequest
+{
+    /**
+     * Determine if the user is authorized to make this request.
+     */
+    public function authorize(): bool
+    {
+        return $this->user() !== null;
+    }
+
+    /**
+     * Get the validation rules that apply to the request.
+     *
+     * @return array<string, ValidationRule|array<mixed>|string>
+     */
+    public function rules(): array
+    {
+        return [
+            'workspace_id' => ['required', 'integer', 'exists:workspaces,id'],
+        ];
+    }
+}