feat: режим индикаторов без цветовой кодировки + переустройство /setup

Новая настройка app_settings.indicator_mode (color | accessible), переключается
на /setup. В режиме accessible сигналы, которые раньше держались только на цвете,
переходят на форму/текст:
- качество цены (0-9) — 5-ступенчатый signal-meter вместо градиентной точки/числа;
  единый модуль web/static/price-quality.js, ветвление по window.QF_INDICATOR_MODE;
- вкладка «Ценообразование»: ведущая колонка-meter вместо заливки строк,
  пометка W вместо амбер-подсветки world-цен, ⚠ вместо красного «загрязнённого» итога.
- GET/PUT /api/settings/ui (без рестарта), регистрируется в обоих наборах роутов.

/setup переустроен: две колонки одной высоты, кнопка «Вернуться в приложение»,
исправлен <title>.

Документация: bible-local 02/03/04 + decisions/2026-08-31-accessible-indicator-mode.md

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LbRvQgPZpM4SJTaX3iLrXk

bible-local/03-database.md

@@ -17,7 +17,7 @@ Main tables:
 | `local_partnumber_book_items` | PN -> LOT catalog payload |
 | `pending_changes` | sync queue |
 | `connection_settings` | encrypted MariaDB connection settings |
-| `app_settings` | local app state |
+| `app_settings` | local app state (key→value); includes `indicator_mode` = `color` \| `accessible`, a per-client display preference set on `/setup` |
 | `local_schema_migrations` | applied local migration markers |
 | `local_qt_settings` | server-pushed configurator settings cache (from `qt_settings`) |
 
@@ -261,7 +261,9 @@ PK: lot_name
 | price | decimal(12,2) NOT NULL | |
 | price_quality | tinyint unsigned, nullable | added by migration 033. Set by the external pricelist-building tool, 0-9, based on quote recency/count per its own per-lot pricing-period settings — QF only reads and displays it, never computes it. |
 
-`price_quality` is synced through `LocalPricelistItem` (pricelist detail page) and, separately, through `LocalComponent`/`services.ComponentView` (`/api/components`, used by the configurator's search dropdown and item table) — both read paths go through `pricelistItemRow`/`toLocalComponent()` in `internal/localdb/components.go`. The `/api/components` path reads the component universe (`world` ∪ `estimate`, see [decisions/2026-07-24-component-universe-world-union.md](decisions/2026-07-24-component-universe-world-union.md)), where a world-only LOT is forced to `price_quality = 0` — the only place QF writes this field rather than reading it. The color scale (red 0 → yellow 5 → green 9, gradient) lives in **one shared JS module**, `web/static/price-quality.js` (loaded by `base.html` for every page) — `priceQualityColor`/`qualityDotHtml`/`qualityBadgeHtml`/`qualityRowStyle`. Do not reimplement the color scale locally in a template; add a new helper to that module instead. Used in: pricelist detail "Качество" column, configurator search dropdown (colored dot), configurator table (leftmost quality-dot column), pricing tab (row background tint).
+`price_quality` is synced through `LocalPricelistItem` (pricelist detail page) and, separately, through `LocalComponent`/`services.ComponentView` (`/api/components`, used by the configurator's search dropdown and item table) — both read paths go through `pricelistItemRow`/`toLocalComponent()` in `internal/localdb/components.go`. The `/api/components` path reads the component universe (`world` ∪ `estimate`, see [decisions/2026-07-24-component-universe-world-union.md](decisions/2026-07-24-component-universe-world-union.md)), where a world-only LOT is forced to `price_quality = 0` — the only place QF writes this field rather than reading it. The visual scale lives in **one shared JS module**, `web/static/price-quality.js` (loaded by `base.html` for every page) — `priceQualityColor`/`priceQualityLevel`/`qualityMeterHtml`/`qualityDotHtml`/`qualityBadgeHtml`/`qualityRowStyle`. Do not reimplement the scale locally in a template; add a new helper to that module instead. Used in: pricelist detail "Качество" column, configurator search dropdown, configurator table (leftmost quality column), pricing tab.
+
+The module has **two render modes**, chosen per client by `window.QF_INDICATOR_MODE` (injected by `base.html` from `app_settings.indicator_mode`, default `color`): `color` = hue scale red 0 → yellow 5 → green 9; `accessible` = colour-blind-safe 5-step signal-strength meter (`priceQualityLevel`: `0-1/2-3/4-5/6-7/8-9`), single neutral hue. In `accessible` mode the pricing tab drops the row background tint for a leading meter column, the `world`-fallback amber cell tint becomes a `W` text marker, and the "contaminated total" red becomes a `⚠` prefix — see [decisions/2026-08-31-accessible-indicator-mode.md](decisions/2026-08-31-accessible-indicator-mode.md). Any new colour-only signal must add a branch in this module keyed on `isAccessible()`, not a local one.
 
 The real table also has `price_method`, `price_period_days`, `price_coefficient`, `manual_price`, `meta_prices` and `lead_time_weeks` columns, owned and written by the external pricing engine that maintains `qt_pricelist_items` — **keep them in the table for backward compatibility with that system; QF must never drop, rename, or write to them.** QF itself does not model, sync, or display any of them (tried once, removed as unused/dead in the client). Do not re-add them to `models.PricelistItem`/`LocalPricelistItem` without a concrete UI need.