feat: world-прайслист как заглушка для отсутствующих цен

Там, где для LOT нет цены в estimate/warehouse/competitor, подставляется
цена из world-прайслиста. Такие ячейки в таблицах «Цена покупки»/«Цена продажи»
подсвечиваются (amber), участвуют в «Итого» и убирают красную «*».
В CSV-экспорте добавлена колонка «Заглушка (world)» с перечнем столбцов,
где сработал фолбэк.

Добавлены Tx-версии GetLatestLocalPricelistBySource/GetLocalPricesForLots,
чтобы резолв прайслистов внутри транзакции не дедлочил single-connection пул.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bible-local/04-api.md

@@ -50,7 +50,7 @@
 | --- | --- | --- |
 | `POST` | `/api/quote/validate` | validate config items |
 | `POST` | `/api/quote/calculate` | calculate quote totals |
-| `POST` | `/api/quote/price-levels` | resolve estimate/warehouse/competitor prices |
+| `POST` | `/api/quote/price-levels` | resolve estimate/warehouse/competitor prices (falls back to `world` source per column, see [decisions/2026-07-10-world-pricelist-fallback.md](decisions/2026-07-10-world-pricelist-fallback.md)) |
 | `POST` | `/api/export/csv` | export a single configuration |
 | `GET` | `/api/configs/:uuid/export` | export a stored configuration |
 | `GET` | `/api/projects/:uuid/export` | legacy project BOM export |

bible-local/decisions/2026-07-10-world-pricelist-fallback.md

@@ -0,0 +1,45 @@
+# Decision: `world` pricelist as a fallback stub for missing prices
+
+**Date:** 2026-07-10
+**Status:** active
+
+## Context
+
+Four pricelist `source` values sync from the server: `estimate`, `warehouse`, `competitor`,
+`world`. Only the first three were ever read — `world` synced into `local_pricelists` /
+`local_pricelist_items` but nothing consumed it, so LOTs with no warehouse/competitor price
+showed as "—" in the "Ценообразование" tab, which also broke the "Итого" coverage (red "*").
+
+## Decision
+
+`world` is a fallback stub, applied per-column, only when the native price for that column
+is missing or ≤ 0:
+
+- Resolution order per column: native source price → `world` price → still missing.
+- Applies to all three Buy columns (Estimate, Склад, Конкуренты), the Sale table (same
+  unit prices, multiplied by the existing sale coefficients), and CSV export.
+- A world-fallback price counts toward "Итого" like a native price (closes the red "*" gap).
+- UI marks only the specific cell that used a fallback, with `bg-amber-50 text-amber-700`
+  (amber was chosen because `applyCustomPrice()` strips `gray/green/red/blue` text-color
+  classes via regex on vendor-price cells — amber survives that).
+- CSV keeps price values untouched (no suffixes) and adds one trailing comment column,
+  "Заглушка (world)", listing which columns used the fallback per row (e.g.
+  `world: Stock, Конкуренты`), always present regardless of export options so column counts
+  stay aligned across header/rows/summary.
+- `world` is resolved independently in each call site (`quote.go` `CalculatePriceLevels`,
+  `export.go` `resolvePricingTotals`) via "explicit ID → latest active → latest local", same
+  pattern as the other three sources. It is intentionally NOT added to `levelBySource` /
+  `ResolvedPricelistIDs` as a fourth on-screen level.
+- `NormalizePricelistSource("world")` returns `PricelistSourceWorld`, not `estimate` — it must
+  not collapse into the estimate source.
+
+## Consequences
+
+- `PriceLevelsItem` (API `POST /api/quote/price-levels`) carries three new bools:
+  `estimate_from_world`, `warehouse_from_world`, `competitor_from_world`.
+- `price_missing` on that endpoint only lists a source when BOTH the native and the
+  `world` price are unavailable.
+- No new config-level column (e.g. `world_pricelist_id`) — world always resolves to
+  "latest active `world` pricelist," not a per-configuration pin.
+- If no `world` pricelist exists locally, behavior is unchanged (missing prices stay "—",
+  no error).