Add PreUp, PostUp, PreDown, PostDown for client (#1714)

* Fix create client popup background is not white

* Fix no Add button when client Allowed Ips or Server Allowed Ips is empty

* Add preUp preDown postUp postDown for client

* Add description of hooks for client config

* Move hooks's label text into 'hooks' in en.json

---------

Co-authored-by: yanghuanglin <yanghuanglin@qq.com>
Co-authored-by: Bernd Storath <999999bst@gmail.com>

src/server/database/migrations/meta/0000_snapshot.json

@@ -1,7 +1,7 @@
 {
   "version": "6",
   "dialect": "sqlite",
-  "id": "b1dde023-d141-4eab-9226-89a832b2ed2b",
+  "id": "2cabecf8-93d5-4d32-81b7-2e4369c1cb29",
   "prevId": "00000000-0000-0000-0000-000000000000",
   "tables": {
     "clients_table": {
@@ -42,6 +42,38 @@
           "notNull": true,
           "autoincrement": false
         },
+        "pre_up": {
+          "name": "pre_up",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "''"
+        },
+        "post_up": {
+          "name": "post_up",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "''"
+        },
+        "pre_down": {
+          "name": "pre_down",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "''"
+        },
+        "post_down": {
+          "name": "post_down",
+          "type": "text",
+          "primaryKey": false,
+          "notNull": true,
+          "autoincrement": false,
+          "default": "''"
+        },
         "private_key": {
           "name": "private_key",
           "type": "text",