Run file names, audit-list fix, and named query row types

[martsokha]

Three related changes to the run/file query layer, one commit each.

1. Fix: audit/artifact files leaking into the file list

cursor_list_workspace_files builds its count and item-fetch queries separately; the count filtered file_kind IN (original, redacted) but the fetch query omitted it. So audit (and would-be artifact) rows were returned in the list even though the total count excluded them — after running detection this showed up as analysis.audit rows in listFiles. Reapplies the document-kind filter to the fetch query.

(Read-path only; existing audit rows stop appearing as soon as the server runs this — no migration, no data change.)

2. Feat: show input/output file names on runs

Runs exposed only inputFileId/outputFileId (raw UUIDs). Now the file display names are resolved so a run renders without a follow-up lookup:

• listRuns joins the input file (one LEFT JOIN per query) and returns its name.
• Single-run responses (get / create / replay / redact) resolve input and output names via a run_file_names query method (indexed lookups; output only when present).
• PipelineRun gains inputFileName / outputFileName (omitted when absent, e.g. a file removed by retention).

3. Refactor: name the query row types instead of positional tuples

• Both list queries now return a named PipelineRunListRow { run, account, pipeline_slug, input_file_name } instead of a growing (WithAccountRef, Handle, Option<String>) tuple (also clears clippy's very complex type).
• imported_files_for_connection → Vec<ImportedFileRef { source_key, file_id, storage_path }> and files_due_for_expiry → Vec<ExpiredFileRef { id, storage_path, storage_bucket }> — previously (String, Uuid, String) / (Uuid, String, String), same-typed positional fields a caller could transpose. #[derive(Queryable)] keeps the select tuples unchanged; the retention sweep and sync-reconciliation callers now read fields by name.

Testing

Full gate green (check / fmt / clippy / doc / test).

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