* [refac] Remove explicit charset and collation declarations from SQL files

- Remove DEFAULT CHARSET declarations from all SQL table definitions
- Strip COLLATE clauses from field definitions across all database scripts
- Simplify ENGINE declarations by removing redundant charset specifications
- Standardize SQL statement formatting for improved database compatibility
- Affects all database update scripts from version 0.1 to 21.7.6

db/update8.3.1.sql

@@ -1,2 +1,2 @@
 ALTER TABLE `zt_branch` ADD `order` smallint unsigned NOT NULL AFTER `name`;
-ALTER TABLE `zt_module` ADD `deleted` enum('0','1') COLLATE 'utf8_general_ci' NOT NULL DEFAULT '0';
+ALTER TABLE `zt_module` ADD `deleted` enum('0','1') NOT NULL DEFAULT '0';