Execute GET/POST/PUT/DELETE queries like Kibana Dev Tools.
Search results are displayed as table rows with _id + _source fields.
Also hide database selector for Elasticsearch connections.
Add schema selector to the editor toolbar for schema-aware databases
(PostgreSQL, SQL Server, Oracle). When a schema is selected, the backend
sets the appropriate search_path before executing queries so users no
longer need to write schema-qualified table names.
Extract 11 composables and 5 layout components from App.vue, reducing it
from 1921 to 327 lines. Unify dialog overlay style across DialogContent
and DialogScrollContent for consistent backdrop appearance.