Timers: LTC from the audio signal itself via an external reader

ProPresenter 21.4 exposes no timecode through any API, so read the LTC
where it actually lives — the audio feed:

- tools/ltc-reader.js: zero-dependency SMPTE LTC decoder (biphase-mark,
  adaptive bit clock, envelope-scaled comparator) fed s16le PCM on stdin
  from ffmpeg/sox; POSTs running/stopped/nosignal + timecode + frame rate
  (incl. 29.97 drop-frame) to the module. --selftest runs an encoder→
  decoder suite (24/25/30 fps, DF minute counting, low level + noise + DC,
  dropout recovery); --demo synthesizes live LTC through the real decoder
  and ingest path with no audio hardware.
- Module: POST /ltc ingest route (optional bearer token, validated body,
  6 s staleness with automatic fallback to the API probe / stage source),
  richer LTC state (status, fps, df, reader source), health messages.
- Client: LTC card shows Running · <rate> / Stopped (held frame) /
  No signal; works LTC-only with no ProPresenter host configured; the
  reader-fed card no longer grays out when only ProPresenter is down.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

modules/propresenter-timers/module.json

@@ -1,7 +1,7 @@
 {
   "id": "propresenter-timers",
   "name": "Timers",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Live ProPresenter timers and LTC timecode",
   "client": "client.js",
   "server": "server.js",
@@ -23,6 +23,11 @@
       "type": "password",
       "label": "Stage display password (for LTC — ProPresenter Settings → Network)",
       "default": ""
+    },
+    "ingestToken": {
+      "type": "password",
+      "label": "LTC reader token (optional — must match tools/ltc-reader.js --token)",
+      "default": ""
     }
   }
 }