Merge origin/beta into feat/accounting-inbound-invoices

Resolves the 7 feature-flag / i18n conflicts (accounting flags vs upstream's
Project Overview 'projects' flag, both registered in the same files) as
additive unions — accounting + incomingInvoices + expenses AND projects all
coexist. Migrations slot cleanly: projects 117-121, accounting 122-129, no
collisions. Frontend build + backend node --check pass.

frontend/src/contexts/FeatureFlagsContext.tsx

@@ -56,6 +56,10 @@ export const DEFAULT_FLAGS: FeatureFlags = {
   // Expenses (migration 127) — internal expenses (mileage / per-diem / cash).
   // Separate Accounting sub-feature; requires `accounting`.
   expenses: false,
+  // Projects (migration 120). Admin-only grouping layer above events +
+  // the Project Overview cockpit. Off by default — admin opts in under
+  // Settings → Features once they want the CRM → Overview area.
+  projects: false,
 };
 
 export const FEATURE_FLAGS_QUERY_KEY = ['feature-flags'] as const;