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/repositories/client/schema.ts

@@ -14,6 +14,10 @@ export const client = sqliteTable('clients_table', {
   name: text().notNull(),
   ipv4Address: text('ipv4_address').notNull().unique(),
   ipv6Address: text('ipv6_address').notNull().unique(),
+  preUp: text('pre_up').default('').notNull(),
+  postUp: text('post_up').default('').notNull(),
+  preDown: text('pre_down').default('').notNull(),
+  postDown: text('post_down').default('').notNull(),
   privateKey: text('private_key').notNull(),
   publicKey: text('public_key').notNull(),
   preSharedKey: text('pre_shared_key').notNull(),