feat(phase-39): role-based access control overhaul + forced password change

- Add must_change_password field to User model with migration b023

- Add POST /auth/change-password endpoint with password policy validation

- Add require_password_changed dependency to block requests until password is changed

- Add ChangePasswordModal with live password policy checklist (forced on first login)

- Show password policy in CreateUserModal and EditUserModal

- Fix backend permissions: tests, campaigns, templates, reports, evidence, worklogs

- red_tech/blue_tech: execute only, cannot create tests/campaigns/templates

- red_lead/blue_lead: create/edit tests/campaigns/templates, generate reports, no system access

- viewer: read-only everywhere, can generate reports

- Fix frontend role checks across TestDetailPage, TestDetailHeader, TeamTabs, TestsPage, CampaignsPage, CampaignDetailPage, Sidebar

frontend/src/pages/CampaignsPage.tsx

@@ -56,7 +56,7 @@ export default function CampaignsPage() {
     target_platform: "",
   });
 
-  const canCreate = user?.role === "admin" || user?.role === "red_tech";
+  const canCreate = user?.role === "admin" || user?.role === "red_lead" || user?.role === "blue_lead";
 
   const { data, isLoading, error } = useQuery({
     queryKey: ["campaigns", filters],