Merge upstream/master into develop

Sync upstream changes from perfect-panel/server

  Includes updates from v1.0.1 to v1.2.5:
  - Currency configuration support
  - Subscribe improvements (short token, inventory check, etc.)
  - Node management enhancements
  - Database migrations
  - Bug fixes and optimizations

initialize/migrate/database/02123_subscribe_original.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE `subscribe`
+DROP COLUMN `show_original_price`;

initialize/migrate/database/02123_subscribe_original.up.sql

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+ALTER TABLE `subscribe`
+    ADD COLUMN `show_original_price` TINYINT(1) NOT NULL DEFAULT 0 COMMENT 'display the original price: 0 not display, 1 display'  AFTER `created_at`;

initialize/migrate/database/02124_server_group_delete.up.sql

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+DROP TABLE IF EXISTS `server_group`;

initialize/migrate/database/02125_subscribe_stock.down.sql

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+
+-- This migration script reverts the inventory values in the 'subscribe' table
+UPDATE `subscribe`
+SET `inventory` = 0
+WHERE `inventory` = -1;

initialize/migrate/database/02125_subscribe_stock.up.sql

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+-- Update the `subscribe` table to set `inventory` to -1 where it is currently 0
+UPDATE `subscribe`
+SET `inventory` = -1
+WHERE `inventory` = 0;