Add customergroup sort with bulk order and locked implicit names.

Reorder via customergroup.order (exact id list → sort 0…n-1); block renaming POS/Lieferanten while still allowing create/update of other groups by name.

src/sql/customergroup.js

@@ -1,13 +1,13 @@
 export const CREATE = `
-INSERT INTO customergroup (name, company_id)
-OUTPUT INSERTED.id, INSERTED.name
-VALUES (@name, @companyId)
+INSERT INTO customergroup (name, company_id, sort)
+OUTPUT INSERTED.id, INSERTED.name, INSERTED.sort
+VALUES (@name, @companyId, @sort)
 `;
 
 export const CREATE_WITHOUT_COMPANY = `
-INSERT INTO customergroup (name)
-OUTPUT INSERTED.id
-VALUES (@name)
+INSERT INTO customergroup (name, sort)
+OUTPUT INSERTED.id, INSERTED.name, INSERTED.sort
+VALUES (@name, @sort)
 `;
 
 export const SET_COMPANY = `
@@ -17,28 +17,46 @@ WHERE id = @id
 `;
 
 export const GET_BY_COMPANY_AND_NAME = `
-SELECT id, name
+SELECT id, name, sort
 FROM customergroup
 WHERE company_id = @companyId AND name = @name
 `;
 
 export const LIST_BY_COMPANY = `
-SELECT id, name
+SELECT id, name, sort
 FROM customergroup
 WHERE company_id = @companyId
-ORDER BY name, id
+ORDER BY sort ASC, name ASC, id ASC
 `;
 
 export const GET_BY_COMPANY_AND_ID = `
-SELECT id, name
+SELECT id, name, sort
 FROM customergroup
 WHERE id = @id AND company_id = @companyId
 `;
 
-export const UPDATE_NAME = `
+export const GET_NEXT_SORT = `
+SELECT ISNULL(MAX(sort), -1) + 1 AS sort
+FROM customergroup
+WHERE company_id = @companyId
+`;
+
+export const LIST_IDS_BY_COMPANY = `
+SELECT id
+FROM customergroup
+WHERE company_id = @companyId
+`;
+
+export const UPDATE = `
 UPDATE customergroup
 SET name = @name
-OUTPUT INSERTED.id, INSERTED.name
+OUTPUT INSERTED.id, INSERTED.name, INSERTED.sort
+WHERE id = @id AND company_id = @companyId
+`;
+
+export const UPDATE_SORT = `
+UPDATE customergroup
+SET sort = @sort
 WHERE id = @id AND company_id = @companyId
 `;