feat(revisions): add pruning estimate and cleanup endpoints

Implemented new endpoints for estimating and pruning revisions, including detailed schemas for requests and responses. The `RevisionPruneEstimate` and `RevisionPruneResult` components were added to the OpenAPI documentation, enhancing the API's functionality for managing revision retention. Updated the backend to support these operations and integrated them into the tenant settings UI for improved user interaction.

internal/httpapi/routes.go

@@ -59,6 +59,8 @@ func (s *Server) registerV1(m *http.ServeMux) {
 	m.HandleFunc("POST /modules/{module_id}/refresh", s.handleModuleRefresh)
 	m.HandleFunc("POST /tenant/refresh", s.handleTenantRefresh)
 	m.HandleFunc("GET /revisions", s.handleListRevisions)
+	m.HandleFunc("GET /revisions/prune-estimate", s.handleRevisionPruneEstimate)
+	m.HandleFunc("POST /revisions/prune", s.handleRevisionPrune)
 	m.HandleFunc("GET /revisions/{revision_id}", s.handleGetRevision)
 	m.HandleFunc("GET /revisions/{revision_id}/preview", s.handleRevisionPreview)
 	m.HandleFunc("GET /revisions/{revision_id}/diagnostic-log", s.handleRevisionDiagnosticLog)