feat: fetch and display NIP-22 comment counts on issues and proposals

Download kind-1111 NIP-22 comments from relays and show a comment count
in the detail view of `ngit list <id>` and `ngit issue list <id>`.

- git_events: add KIND_COMMENT constant (kind 1111)
- client: import KIND_COMMENT; add `comments` field to FetchReport;
  route kind-1111 events into report.comments in process_fetched_events;
  consolidate comments across relay reports; display "N comment(s)" in
  FetchReport; add a #E-tagged kind-1111 filter in get_fetch_filters
  covering all known issue and proposal root IDs
- issue_list: add get_comment_counts() to query the local cache for
  kind-1111 events by #E tag and count per issue; extend the filtered
  tuple with comment_count; show a CMTS column in the table, a
  "Comments: N" line in the detail view, and a "comments" field in JSON
- list: add KIND_COMMENT import; add resolve_event_id() helper and
  get_comment_count_for_proposal() to look up the count for a single
  proposal from the local cache; pass comment_count into
  show_proposal_details(); display "Comments: N" in plain text and
  "comments" in JSON; align detail-view labels

0 files changed, 0 insertions, 0 deletions