feat: implement vendor spec BOM import and PN→LOT resolution (Phase 1)

- Migration 029: local_partnumber_books, local_partnumber_book_items,
  vendor_spec TEXT column on local_configurations
- Models: LocalPartnumberBook, LocalPartnumberBookItem, VendorSpec,
  VendorSpecItem with JSON Valuer/Scanner
- Repository: PartnumberBookRepository (GetActiveBook, FindLotByPartnumber,
  SaveBook/Items, ListBooks, CountBookItems)
- Service: VendorSpecResolver 3-step resolution (book → manual suggestion
  → unresolved) + AggregateLOTs with is_primary_pn qty logic
- Sync: PullPartnumberBooks append-only pull from qt_partnumber_books
- Handlers: VendorSpecHandler (GET/PUT/resolve/apply), PartnumberBooksHandler
- Routes: /api/configs/:uuid/vendor-spec*, /api/partnumber-books,
  /api/sync/partnumber-books, /partnumber-books page
- UI: 3 top-level tabs [Estimate][BOM вендора][Ценообразование]; Excel paste,
  PN resolution, inline LOT autocomplete, pricing table
- Bible: 03-database.md updated, 09-vendor-spec.md added

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

migrations/029_add_vendor_spec_and_partnumber_books.sql

@@ -0,0 +1,22 @@
+-- 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;