docs(smoke): add srs whep setup guide

docs/smoke/srs.md

@@ -10,6 +10,7 @@ Use these checks when you want to verify RTMP interoperability or a real cvmmap-
 
 - Synthetic RTMP smoke using `rtmp_output_tester`
 - Live cvmmap ingest -> FFmpeg encoder -> RTMP -> SRS HTTP-FLV forward
+- Live cvmmap ingest -> FFmpeg encoder -> RTMP -> SRS WHEP/WebRTC playback
 
 ## Prerequisites
 
@@ -94,6 +95,54 @@ Expected success signals:
 
 The HTTP-FLV probe is the authoritative pass/fail signal. The optional `ffmpeg` decode sample is best-effort because a very short bounded publish can disappear before the second client attaches.
 
+## Manual Test: WHEP / WebRTC
+
+SRS supports WHEP playback, and it is the better path when RTMP or HTTP-FLV playback feels too slow.
+
+This repo includes a local SRS config copy at [srs.local.conf](/home/crosstyan/Code/cvmmap-streamer-ffmpeg-mcap/docs/smoke/srs.local.conf). It enables:
+
+- RTMP publish on `:1935`
+- HTTP API on `:1985`
+- HTTP player pages on `:8080`
+- WebRTC UDP on `:8000`
+- `rtmp_to_rtc on`
+
+Start SRS with that config:
+
+```bash
+cd ~/Code/srs/trunk
+./objs/srs -t -c /home/crosstyan/Code/cvmmap-streamer-ffmpeg-mcap/docs/smoke/srs.local.conf
+./objs/srs -c /home/crosstyan/Code/cvmmap-streamer-ffmpeg-mcap/docs/smoke/srs.local.conf
+```
+
+Publish from the streamer:
+
+```bash
+cd ~/Code/cvmmap-streamer-ffmpeg-mcap
+./build/cvmmap_streamer \
+  --run-mode pipeline \
+  --input-uri 'cvmmap://zed@/tmp/cvmmap' \
+  --codec h264 \
+  --encoder-backend ffmpeg \
+  --encoder-device nvidia \
+  --rtmp \
+  --rtmp-url 'rtmp://127.0.0.1/live/zed_live' \
+  --rtmp-transport libavformat \
+  --rtmp-mode enhanced
+```
+
+Open the WHEP player page in a browser:
+
+- Player page: `http://127.0.0.1:8080/players/whep.html`
+- WHEP API URL: `http://127.0.0.1:1985/rtc/v1/whep/?app=live&stream=zed_live`
+
+Notes:
+
+- VLC is not the right client for WHEP. Use a browser or another WebRTC/WHEP-capable player.
+- Keep the stream codec on `h264` for browser compatibility.
+- If the browser runs on another host and SRS picks the wrong NIC, replace `candidate *;` in [srs.local.conf](/home/crosstyan/Code/cvmmap-streamer-ffmpeg-mcap/docs/smoke/srs.local.conf) with the reachable host IP.
+- On this machine, likely candidates are `192.168.2.13` or `192.168.2.184`.
+
 ## Example Live Result
 
 For a ZED source running at `cvmmap://zed@/tmp/cvmmap`, the successful forward probe looked like: