feat(vendor-spec): BOM import, LOT autocomplete, pricing, partnumber_seen push

- BOM paste: auto-detect columns by content (price, qty, PN, description);
  handles $5,114.00 and European comma-decimal formats
- LOT input: HTML5 datalist rebuilt on each renderBOMTable from allComponents;
  oninput updates data only (no re-render), onchange validates+resolves
- BOM persistence: PUT handler explicitly marshals VendorSpec to JSON string
  (GORM Update does not reliably call driver.Valuer for custom types)
- BOM autosave after every resolveBOM() call
- Pricing tab: async renderPricingTab() calls /api/quote/price-levels for all
  resolved LOTs directly — Estimate prices shown even before cart apply
- Unresolved PNs pushed to qt_vendor_partnumber_seen via POST
  /api/sync/partnumber-seen (fire-and-forget from JS)
- sync.PushPartnumberSeen(): upsert with ON DUPLICATE KEY UPDATE last_seen_at
- partnumber_books: pull ALL books (not only is_active=1); re-pull items when
  header exists but item count is 0; fallback for missing description column
- partnumber_books UI: collapsible snapshot section (collapsed by default),
  pagination (10/page), sync button always visible in header
- vendorSpec handlers: use GetConfigurationByUUID + IsActive check (removed
  original_username from WHERE — GetUsername returns "" without JWT)
- bible/09-vendor-spec.md: updated with all architectural decisions

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

migrations/029_add_vendor_spec_and_partnumber_books.sql

@@ -1,22 +0,0 @@
--- local_partnumber_books: version snapshots of vendor PN → LOT mappings (pull-only from PriceForge)
-CREATE TABLE IF NOT EXISTS local_partnumber_books (
-    id         INTEGER PRIMARY KEY AUTOINCREMENT,
-    server_id  INTEGER UNIQUE NOT NULL,
-    version    TEXT    NOT NULL,
-    created_at DATETIME NOT NULL,
-    is_active  INTEGER NOT NULL DEFAULT 1
-);
-
--- local_partnumber_book_items: PN → LOT mappings within a book snapshot
-CREATE TABLE IF NOT EXISTS local_partnumber_book_items (
-    id            INTEGER PRIMARY KEY AUTOINCREMENT,
-    book_id       INTEGER NOT NULL,
-    partnumber    TEXT    NOT NULL,
-    lot_name      TEXT    NOT NULL,
-    is_primary_pn INTEGER NOT NULL DEFAULT 0,
-    description   TEXT
-);
-CREATE INDEX IF NOT EXISTS idx_local_book_pn ON local_partnumber_book_items(book_id, partnumber);
-
--- vendor_spec column: JSON array of BOM rows stored per configuration
-ALTER TABLE local_configurations ADD COLUMN vendor_spec TEXT;