a93b6dc232
1. requireFeatureFlag now caches each flag for 10s (the accounting area is 10+ gated endpoints); PUT /admin/feature-flags invalidates the cache so toggles still take effect immediately. 2. Customer routes (/quotes, /invoices, /contracts + their PDFs) now gate via getEffectiveFeaturesForCustomer — the global MASTER flag AND the per-customer override — instead of the per-customer column alone, via a shared customerFeatureAllowed() helper. Admin disabling a feature globally is now honoured for customers too. 4. Tax-report VAT-payable: when accounting_vat_registered is UNSET, stop guessing from grandTotalVat>0 (a zero-output-VAT quarter silently flipped to "not registered" and hid the reclaim). Treat null as "not configured": vatPayableMinor=null + vatRegistrationConfigured=false; the UI renders "—" and a "configure VAT registration" warning. Tests updated. 5. Shared upsertAppSetting() in utils/appSettings — the two adminSettings upsert loops use it, so the app_settings created_at class can't be re-introduced. 6. PDF rasterise per-file bound: getRenderedPagePath refuses pages beyond MAX_RENDERABLE_PAGES (200); page_count is capped to match at ingest, so a hostile high-page PDF can't drive an unbounded pager. 7. (no code) original_filename is only rendered via auto-escaped JSX; the two dangerouslySetInnerHTML sites are admin-authored content — paranoia pass clean. Concerns 3 (foreign-VAT reclaim-country) and 8 (imap_pass plaintext) are PR-reply / doc items, addressed in the PR response, not code.