feat(admin): bot management (list, verify, create, delete)

- Add a Bots admin tab: list/search bots with a dedicated read query
  (users.is_bot, excluded from the accounts list), showing owner and
  system-vs-user type
- Create system bots from the admin via a new bot.create command that
  reuses the existing bot provisioning flow; the token is shown once
- Delete user-created bots via a new bot.delete command backed by a
  dedicated Postgres DeleteBotAccount (revokes sessions, purges private
  state, releases username, drops the bots row, tombstones the user);
  system service bots are rejected
- Verified badge toggling reuses the existing set-verified command
- All write paths go through the dry-run/confirm + audit command pipeline
- Rebuild dist bundle

cmd/telesrv-admin/web/src/components/Layout.tsx

@@ -1,4 +1,5 @@
 import {
+  Bot,
   ChevronDown,
   Database,
   LayoutDashboard,
@@ -76,6 +77,7 @@ export function Shell({
           <NavLink icon={<LayoutDashboard size={16} />} href="/" route={route} navigate={navigate}>{t("layout.dashboard")}</NavLink>
           <NavLink icon={<Users size={16} />} href="/accounts" route={route} navigate={navigate}>{t("layout.accounts")}</NavLink>
           <NavLink icon={<ShieldCheck size={16} />} href="/channels" route={route} navigate={navigate}>{t("layout.channels")}</NavLink>
+          <NavLink icon={<Bot size={16} />} href="/bots" route={route} navigate={navigate}>{t("layout.bots")}</NavLink>
 			<NavLink icon={<Gift size={16} />} href="/gifts" route={route} navigate={navigate}>{t("layout.gifts")}</NavLink>
           <div className={`nav-section ${messagesActive ? "active" : ""} ${messagesOpen ? "open" : ""}`}>
             <button