feat(M3): contracts editor, templates, PDF render via Puppeteer/Chromium

Backend:
- numbers.ts — per-org per-doctype per-year sequential numbering (ДГ-2026/001, СЧ-2026/001…)
- money.ts — line totals + Russian rubInWords helper
- documents/routes.ts — CRUD with transactional lines bulk-replace, status changes, history endpoint for client-line autocomplete
- templates/routes.ts — CRUD + instantiate (clones template body into new draft document)
- shared/render/toHtml.ts — block→HTML renderer with placeholder substitution ({{customer.inn}}, {{contract.number}}, {{today}}…)
- documents/pdf.ts — Puppeteer-based PDF rendering with auto-detected Chromium executable
- documents/pdf.routes.ts — GET /:id/preview (HTML) and GET /:id/pdf
- Dockerfile.api — added apk chromium + cyrillic fonts

Web:
- api.ts — Document, DocumentTemplate, Block, LineHistoryItem types
- BlocksEditor — generic block list with reorder/add/remove and per-block forms (heading, party, services_table, totals, terms, signatures, custom_text, page_break)
- LinesEditor — services rows with auto sumCents, "from catalog" picker, "from history by client" panel
- ClientPicker — reusable client dropdown
- pages: Documents list, DocumentEdit (new+existing), Templates list, TemplateEdit
- richtext.ts — plain↔TipTap-JSON conversion (no TipTap yet, just keeps the format compatible)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/api.ts

@@ -68,7 +68,105 @@ export type Service = {
   name: string;
   unit: string;
   defaultPriceCents: number; // BigInt сериализуется в number (см. apps/api/src/lib/bigint.ts)
-  defaultVat: 'none' | 'vat_0' | 'vat_5' | 'vat_7' | 'vat_10' | 'vat_20';
+  defaultVat: VatRate;
   notes: string | null;
   archivedAt: string | null;
 };
+
+export type VatRate = 'none' | 'vat_0' | 'vat_5' | 'vat_7' | 'vat_10' | 'vat_20';
+export type DocType = 'contract' | 'invoice' | 'act' | 'upd';
+export type DocStatus = 'draft' | 'issued' | 'sent' | 'partially_paid' | 'paid' | 'cancelled' | 'signed';
+
+export type DocumentLine = {
+  id: string;
+  documentId: string;
+  position: number;
+  serviceId: string | null;
+  name: string;
+  qtyMilli: number;
+  unit: string;
+  priceCents: number;
+  vat: VatRate;
+  sumCents: number;
+};
+
+export type DocumentSummary = {
+  id: string;
+  organizationId: string;
+  docType: DocType;
+  number: string;
+  issuedAt: string | null;
+  status: DocStatus;
+  clientId: string | null;
+  client: { id: string; name: string; kind: Client['kind'] } | null;
+  parentDocumentId: string | null;
+  totalCents: number;
+  vatCents: number;
+  currency: string;
+  tochkaDocumentId: string | null;
+  pdfPath: string | null;
+  createdAt: string;
+  updatedAt: string;
+};
+
+export type Document = DocumentSummary & {
+  body: DocBody;
+  client: Client | null;
+  lines: DocumentLine[];
+};
+
+export type DocumentTemplate = {
+  id: string;
+  organizationId: string;
+  docType: DocType;
+  name: string;
+  body: DocBody;
+  createdAt: string;
+  updatedAt: string;
+};
+
+// === Block schema (mirrors packages/shared) ===
+
+export type RichText = {
+  type: string;
+  content?: RichText[];
+  text?: string;
+  marks?: { type: string }[];
+};
+
+export type Block =
+  | { id: string; type: 'heading'; level: 1 | 2 | 3; text: RichText }
+  | { id: string; type: 'paragraph'; text: RichText }
+  | {
+      id: string;
+      type: 'party';
+      role: 'executor' | 'customer';
+      bind: { kind: 'self' } | { kind: 'client'; clientId?: string };
+    }
+  | {
+      id: string;
+      type: 'services_table';
+      columns: Array<'name' | 'qty' | 'unit' | 'price' | 'vat' | 'sum'>;
+      lines: { lineId: string }[];
+    }
+  | { id: string; type: 'totals'; showVat: boolean; showInWords: boolean }
+  | { id: string; type: 'terms'; text: RichText }
+  | { id: string; type: 'signatures'; sides: ('executor' | 'customer')[] }
+  | { id: string; type: 'custom_text'; text: RichText }
+  | { id: string; type: 'page_break' };
+
+export type DocBody = {
+  version: 1;
+  blocks: Block[];
+  vars: Record<string, unknown>;
+};
+
+export type LineHistoryItem = {
+  serviceId: string | null;
+  name: string;
+  unit: string;
+  priceCents: number;
+  vat: VatRate;
+  lastUsed: string;
+  useCount: number;
+};