feat(manifest): add externalNumber reference to quote/order/delivery

- Add `external_number NVARCHAR(100)` column to the `manifest` table.
- Thread `externalNumber` through manifestDoc and delivery SQL (list,
  header, create, update).
- Include `externalNumber` in shapeSummary and quote/order/delivery
  create/update/list/getById handlers (optional, clearable on update).
- Update README type definitions and regenerate API/schema docs.

src/sql/delivery.js

@@ -6,6 +6,7 @@ SELECT
     m.[number],
     m.[type],
     m.entity_id AS supplierId,
+    m.external_number AS externalNumber,
     m.[date]
 FROM manifest m
 WHERE m.company_id = @companyId
@@ -19,6 +20,7 @@ SELECT
     m.[number],
     m.[type],
     m.entity_id AS supplierId,
+    m.external_number AS externalNumber,
     m.[date]
 FROM manifest m
 WHERE m.id = @id
@@ -44,9 +46,9 @@ ORDER BY ma.id
 `;
 
 export const CREATE_MANIFEST = `
-INSERT INTO manifest (company_id, [number], [type], entity_id, [date])
+INSERT INTO manifest (company_id, [number], [type], entity_id, external_number, [date])
 OUTPUT INSERTED.id
-VALUES (@companyId, @number, @type, @entityId, @date)
+VALUES (@companyId, @number, @type, @entityId, @externalNumber, @date)
 `;
 
 export const UPDATE_MANIFEST = `
@@ -54,6 +56,7 @@ UPDATE manifest
 SET
     [number] = @number,
     entity_id = @entityId,
+    external_number = @externalNumber,
     [date] = @date
 WHERE id = @id
   AND company_id = @companyId