PTP: hardware timestamping is not a setting any more

The hw_ts config key was never read (hardware timestamps are always used);
the checkbox suggested it could be turned off. Removed from the config,
the page and the docs; status.ptp.hw_ts still reports it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/index.html

@@ -122,7 +122,6 @@ e.g. curl -X POST http://p4-aes67.local/api/player/next
   <option value="-4">-4 (16/s)</option><option value="-3">-3 (8/s)</option><option value="-2">-2 (4/s)</option>
   <option value="-1">-1 (2/s)</option><option value="0">0 (1/s)</option><option value="1">1 (every 2 s)</option></select></label>
 <label><span>DSCP (PTP)</span><input name="ptp.dscp" type="number" min="0" max="63"></label>
-<label><span>HW timestamping</span><input name="ptp.hw_ts" type="checkbox"></label>
 <small>Transport UDP/IPv4 224.0.1.129 (ports 319/320), delay mechanism E2E.</small>
 </fieldset>
 
@@ -284,7 +283,7 @@ function showPlayer(p) {
 const CORE_DEF = {
   // Intervals follow Riedel SIC AES67 defaults; role/priorities are the "fallback TimeTransmitter" setup.
   ptp:{mode:'multicast',role:'auto',domain:0,priority1:250,priority2:250,log_sync:0,log_announce:1,
-       announce_timeout:3,log_delay_req:0,dscp:46,hw_ts:true},
+       announce_timeout:3,log_delay_req:0,dscp:46},
   aes67:{name:'AES67',enabled:true,mcast:'239.69.1.10',port:5004,ttl:32,dscp:34,pt:96,encoding:'L24',
          rate:'48000',channels:'2',ptime:'1',ssrc:0,clk_offset:0,mono_sum:false,discovery:'sap',session_id:1,session_ver:1},
   net:{hostname:'aes67',vlan:false,web_on:'both',dhcp:true,ip:'',mask:'',gw:'',dns:''},