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/order/getById.js

@@ -0,0 +1,33 @@
+import { ORDER_TYPE } from '../../sql/manifestDoc.js';
+import resolveSelectedCompanyAccess from '../companyuser/resolveSelectedCompanyAccess.js';
+import { loadDoc } from '../manifestDoc/helpers.js';
+
+export default function getById(pool) {
+  const access = resolveSelectedCompanyAccess(pool);
+
+  /**
+   * Returns a single order by its id within the user's selected company.
+   *
+   * @param {number} googleAuthId - The id of the Google auth user.
+   * @param {number} id - The id of the order.
+   * @returns {Promise<{id: number, number: string, type: string, entityId: number|null, date: string, lines: Array<object>}>} The order with its lines.
+   * @throws {Error} If the order is not found.
+   *
+   * @example
+   * const order = await store.order.getById(42, 5);
+   * // => { id, number, type, entityId, date, lines: [...] }
+   */
+  return async (googleAuthId, id) => {
+    if (!Number.isFinite(id)) {
+      throw new Error('Order not found');
+    }
+
+    const { companyId } = await access(googleAuthId);
+
+    const doc = await loadDoc(pool, null, { type: ORDER_TYPE, companyId, id });
+    if (!doc) {
+      throw new Error('Order not found');
+    }
+    return doc;
+  };
+}