fix(mcp): route GaussDB through desktop bridge

crates/dbx-core/assets/database-drivers.manifest.json

@@ -707,7 +707,7 @@
       "dbType": "gaussdb",
       "label": "GaussDB",
       "runtimeMode": "native",
-      "mcpMode": "direct",
+      "mcpMode": "bridge",
       "singleConnectionPool": false,
       "metadataConnectionScoped": false,
       "skipTcpProbe": false,
@@ -975,7 +975,7 @@
       "dbType": "opengauss",
       "label": "openGauss",
       "runtimeMode": "native",
-      "mcpMode": "direct",
+      "mcpMode": "bridge",
       "singleConnectionPool": false,
       "metadataConnectionScoped": false,
       "skipTcpProbe": false,