fix: remove cheight from all CRUD index.ui — let bricks Tabular auto-height

Removed cheight:40 from outer VBox and inner Tabular options in:
- suppliers_list
- sub_resellers_list
- sub_distributors_list
- supply_contracts_list
- distribution_agreements_list

CRUD Tabular handles its own height; hardcoding cheight causes
title row to fill entire viewport.

wwwroot/distribution_agreements_list/index.ui

@@ -1,13 +1,12 @@
 
 {
 	"widgettype":"VBox",
-	"options":{"cheight":40,"width":"100%"},
+	"options":{"width":"100%"},
 	"subwidgets":[{
 	"id":"distribution_agreements_tbl",
 	"widgettype":"Tabular",
 	"options":{
 		"width":"100%",
-		"cheight":40,
 
 
 		"title":"分销协议表",

wwwroot/sub_distributors_list/index.ui

@@ -1,13 +1,12 @@
 
 {
 	"widgettype":"VBox",
-	"options":{"cheight":40,"width":"100%"},
+	"options":{"width":"100%"},
 	"subwidgets":[{
 	"id":"sub_distributors_tbl",
 	"widgettype":"Tabular",
 	"options":{
 		"width":"100%",
-		"cheight":40,
 
 
 		"title":"二级分销商表",

wwwroot/sub_resellers_list/index.ui

@@ -1,13 +1,12 @@
 
 {
 	"widgettype":"VBox",
-	"options":{"cheight":40,"width":"100%"},
+	"options":{"width":"100%"},
 	"subwidgets":[{
 	"id":"sub_resellers_tbl",
 	"widgettype":"Tabular",
 	"options":{
 		"width":"100%",
-		"cheight":40,
 
 
 		"title":"二级分销商表",

wwwroot/suppliers_list/index.ui

@@ -1,13 +1,12 @@
 
 {
 	"widgettype":"VBox",
-	"options":{"cheight":40,"width":"100%"},
+	"options":{"width":"100%"},
 	"subwidgets":[{
 	"id":"suppliers_tbl",
 	"widgettype":"Tabular",
 	"options":{
 		"width":"100%",
-		"cheight":40,
 
 
 		"title":"供应商表",

wwwroot/supply_contracts_list/index.ui

@@ -1,13 +1,12 @@
 
 {
 	"widgettype":"VBox",
-	"options":{"cheight":40,"width":"100%"},
+	"options":{"width":"100%"},
 	"subwidgets":[{
 	"id":"supply_contracts_tbl",
 	"widgettype":"Tabular",
 	"options":{
 		"width":"100%",
-		"cheight":40,
 
 
 		"title":"供销合同表",