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/components/test-detail/TeamTabs.tsx

@@ -119,11 +119,11 @@ export default function TeamTabs({
 
   const canEditRed =
     RED_EDITABLE_STATES.includes(test.state) &&
-    (role === "red_tech" || role === "admin");
+    (role === "red_tech" || role === "red_lead" || role === "admin");
 
   const canEditBlue =
     BLUE_EDITABLE_STATES.includes(test.state) &&
-    (role === "blue_tech" || role === "admin");
+    (role === "blue_tech" || role === "blue_lead" || role === "admin");
 
   // ── Red Team Tab ─────────────────────────────────────────────────