* [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/update1.0.1.sql

@@ -1,5 +1,5 @@
 -- 2010-07-01 task table.
-ALTER TABLE `zt_task` ADD `mailto` VARCHAR( 255 ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' AFTER `statusCustom`;
+ALTER TABLE `zt_task` ADD `mailto` VARCHAR( 255 ) NOT NULL DEFAULT '' AFTER `statusCustom`;
 
 -- 2010-07-05 userquery table.
 CREATE TABLE IF NOT EXISTS `zt_userQuery` (
@@ -14,4 +14,4 @@ CREATE TABLE IF NOT EXISTS `zt_userQuery` (
   KEY `company` (`company`),
   KEY `account` (`account`),
   KEY `module` (`module`)
-  ) ENGINE=MyISAM  DEFAULT CHARSET=utf8;
+) ENGINE=MyISAM;