feat(core): adding opened recent file to segments struct (#3237)

* feat(backend): adding open recent file segments

chore: add relevant snippets to client-open-api

* feat: update snippet count check in extract_snippets_from_segments

clients/tabby-openapi/lib/tabby.d.ts

@@ -257,6 +257,8 @@ export interface components {
              *
              *     Sorted in descending order of [Snippet::score]. */
             relevant_snippets_from_changed_files?: components["schemas"]["Snippet"][] | null;
+            /** @description The relevant code snippets extracted from recently opened files. These snippets are selected from candidates found within code chunks based on the last visited location. Current Active file is excluded from the search candidates. When provided with [Segments::relevant_snippets_from_changed_files], the snippets have already been deduplicated to ensure no duplication with entries in [Segments::relevant_snippets_from_changed_files]. */
+            relevant_snippets_from_recently_opened_files?: components["schemas"]["Snippet"][] | null;
             /** @description Clipboard content when requesting code completion. */
             clipboard?: string | null;
         };