feat: multi-profile support -- create, switch, delete profiles from web UI (Issue #28)

Add full profile management to the web UI, matching the hermes-agent CLI
profile system. Profiles are isolated HERMES_HOME instances with their own
config, skills, memory, cron, and API keys.

Backend: new api/profiles.py wrapping hermes_cli.profiles, dynamic config
reloading, 5 new API endpoints, profile-aware path resolution, HERMES_HOME
env save/restore in streaming, module-level cache patching for skills_tool
and cron/jobs.

Frontend: profile chip in topbar with dropdown, Profiles sidebar panel with
CRUD UI, boot-time profile fetch, cascade refresh on switch.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

static/ui.js

@@ -1,4 +1,4 @@
-const S={session:null,messages:[],entries:[],busy:false,pendingFiles:[],toolCalls:[],activeStreamId:null,currentDir:'.'};
+const S={session:null,messages:[],entries:[],busy:false,pendingFiles:[],toolCalls:[],activeStreamId:null,currentDir:'.',activeProfile:'default'};
 const INFLIGHT={};  // keyed by session_id while request in-flight
 const MSG_QUEUE=[];  // messages queued while a request is in-flight
 const $=id=>document.getElementById(id);
@@ -353,6 +353,9 @@ function syncTopbar(){
     sidebarPath.textContent=ws;
   }
   // modelSelect already set above
+  // Update profile chip label
+  const profileLabel=$('profileChipLabel');
+  if(profileLabel) profileLabel.textContent=S.activeProfile||'default';
 }
 
 function msgContent(m){