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refactor(webui): stream /api/stats + /api/settings via host-tested emit fns (#479)

Second phase of unifying webui JSON on one streaming emit path (after
power+fan). stats_handler/settings_get_handler emitted inline while
routes_json.c held host-test-only DOM mirrors — tests validated a copy the
device never ran.

- routes_json.c: build_stats_json/build_settings_json (DOM) -> emit_stats_json/
  emit_settings_json streaming fns; stats ports the nested asic_chips[] array
  (per-chip object + domain_ghs[]/domain_drops[] sub-arrays) verbatim
- routes.c: stats_handler/settings_get_handler gather the snapshot then delegate
- tests: stats (both native + native-noasic) + settings rewritten to the
  bb_http_host_capture harness driving the real emit fns; portable dupstr (no
  POSIX strdup under -std=c99); every null/sentinel branch covered (routes_json.c
  emit fns at 100%, incl. previously-uncovered stats branches)

Wire format unchanged — /api/stats (incl. nested asic_chips[]) + /api/settings
byte-identical on a live bitaxe-601. Next: pool/diag/knot.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

2795 of 3492 branches covered (80.04%)

Branch coverage included in aggregate %.

108 of 108 new or added lines in 1 file covered. (100.0%)

5429 of 5602 relevant lines covered (96.91%)

147444.31 hits per line