Rewrite store JSDoc, split quote/order into modules, and generate typed API docs

- Rewrite JSDoc across all store methods to document the actual async
  methods (real params, returns, throws) instead of the internal wrappers
- Split quote/order into individual module files backed by shared
  manifestDoc helpers; remove the createStore factory and thin wrappers
- Deduplicate manifest line helpers into src/store/manifestLines.js
- Extend generate-api-doc.js to render parameter/return/throws types and
  emit per-namespace API.<module>.md files with an API.md index
- Regenerate all API docs

src/store/manifestDoc/helpers.js

@@ -0,0 +1,64 @@
+import {
+  GET_MANIFEST_HEADER,
+  GET_MANIFEST_LINES,
+} from '../../sql/manifestDoc.js';
+import {
+  GET_CUSTOMER_BY_ID,
+  POS_GROUP_NAME,
+  SUPPLIER_GROUP_NAME,
+} from '../../sql/entity.js';
+import request from '../request.js';
+import { shapeLine } from '../manifestLines.js';
+
+export function shapeSummary(type, row) {
+  return {
+    id: row.id,
+    number: row.number,
+    type,
+    entityId: row.entityId ?? null,
+    date: row.date,
+  };
+}
+
+export async function assertCustomerEntity(pool, tx, companyId, entityId) {
+  if (entityId == null) {
+    return null;
+  }
+  if (!Number.isFinite(entityId)) {
+    throw new Error('Entity not found');
+  }
+
+  const result = await request(pool, tx)
+    .input('id', entityId)
+    .input('companyId', companyId)
+    .input('supplierGroupName', SUPPLIER_GROUP_NAME)
+    .input('posGroupName', POS_GROUP_NAME)
+    .query(GET_CUSTOMER_BY_ID);
+
+  if (!result.recordset[0]) {
+    throw new Error('Entity not found');
+  }
+  return entityId;
+}
+
+export async function loadDoc(pool, tx, { type, companyId, id }) {
+  const header = await request(pool, tx)
+    .input('id', id)
+    .input('companyId', companyId)
+    .input('type', type)
+    .query(GET_MANIFEST_HEADER);
+
+  const row = header.recordset[0];
+  if (!row) {
+    return null;
+  }
+
+  const lines = await request(pool, tx)
+    .input('manifestId', id)
+    .query(GET_MANIFEST_LINES);
+
+  return {
+    ...shapeSummary(type, row),
+    lines: lines.recordset.map(shapeLine),
+  };
+}