feat(auth,prompt-rule): add password change with session revocation and scope prompt rules by brand

Add self-service password change that re-hashes the credential and bumps a
per-user session version so all existing access/refresh tokens are rejected.
Session version is tracked in Redis with an in-memory fallback and enforced in
middleware and refresh.

Scope prompt rules and rule groups to a brand: new brand_id column (migrated to
a "未归属" fallback brand for existing rows), brand-filtered queries/indexes, and
brand-aware admin-web tabs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/internal/tenant/transport/router_test.go

@@ -24,6 +24,7 @@ func TestProtectedRoutes_RequireAuth(t *testing.T) {
 		path   string
 	}{
 		{http.MethodGet, "/api/auth/me"},
+		{http.MethodPost, "/api/auth/password"},
 		{http.MethodPost, "/api/auth/logout"},
 		{http.MethodPost, "/api/desktop/clients/register"},
 		{http.MethodGet, "/api/tenant/accounts"},