merge: upgrade to upstream v0.50.95 + keep custom additions

Upstream v0.50.95 features merged (Russian localization, slash commands,
mic toggle fix, gateway sync fix, KaTeX/Prism.js, etc.)

Custom additions preserved:
- Tier-2 agent switching commands in commands.js
- MC panel in index.html + MC CSS
- _resolve_cli_toolsets() in config.py
- Custom routes.py, server.py, boot.js, i18n.js, messages.js, workspace.js

Files with conflict resolution (took upstream, custom code in other files):
- CHANGELOG.md, config.py, commands.js, index.html, panels.js, style.css, ui.js

static/boot.js

@@ -422,6 +422,7 @@ function clearPreview(){
   const pc=$('previewCode');if(pc)pc.textContent='';
   const pp=$('previewPathText');if(pp)pp.textContent='';
   const ft=$('fileTree');if(ft)ft.style.display='';
+  const wsSearchClear=$('wsSearchWrap');if(wsSearchClear)wsSearchClear.style.display='';
   _previewCurrentPath='';_previewCurrentMode='';_previewDirty=false;
   // Restore directory breadcrumb after closing file preview
   if(typeof renderBreadcrumb==='function') renderBreadcrumb();
@@ -804,6 +805,8 @@ function applyBotName(){
   if(profileLabel) profileLabel.textContent=S.activeProfile||'default';
   // Fetch available models from server and populate dropdown dynamically
   await populateModelDropdown();
+  // Load commands from Hermes COMMAND_REGISTRY before enabling input
+  await loadCommands();
   // Restore last-used model preference
   const savedModel=localStorage.getItem('hermes-webui-model');
   if(savedModel && $('modelSelect')){