DSH model configuration manager

Key features

• Select the target provider, list its explicit model entries and configuration summary, editable/deletable
• NewEnter the model ID, manually fill in the display name, context window, maximum output, input mode (text/image), inference gear (gear → wire value, leave blank = do not send); both inference gear and input mode support "unset (inherited directory)" to avoid writing unconfigured fields as explicit default values
• Catalog snapshot behaviorWhen creating/applying a model on a catalog provider that has not explicitly configured a model list, the plug-in will write the current model list of the built-in catalog as an explicit entry for the provider (the existing IDs in the catalog are updated in place, and the new IDs are appended), and subsequent edits are based on this explicit list; subsequent updates to the catalog will not be automatically merged into the snapshotted list.
• If the directory provider deletes zero explicit entries, it falls back to the built-in directory (not snapshotted) state.