feat: add DM (Dameng) database support via ODBC

Connect to DM8 databases using the odbc-api crate with unixODBC.
Includes schema browsing, query execution, DDL generation,
and full frontend integration with download link to DM ODBC driver.

src/types/database.ts

@@ -11,7 +11,8 @@ export type DatabaseType =
   | "elasticsearch"
   | "doris"
   | "starrocks"
-  | "redshift";
+  | "redshift"
+  | "dameng";
 
 export interface ConnectionConfig {
   id: string;