feat(dhcp-client): remove top banner, keep only clean Add button

internal/web/static/index.html

@@ -538,24 +538,11 @@
 
         <!-- ================= SECTION: DHCP CLIENT (/ip dhcp-client) ================= -->
         <section id="section-dhcp-client" class="hidden space-y-6">
-          <!-- Top Banner -->
-          <div class="bg-gradient-to-r from-amber-950/40 via-slate-900 to-slate-900 border border-amber-900/30 rounded-xl p-5 flex flex-wrap items-center justify-between gap-4">
-            <div>
-              <div class="flex items-center gap-2 mb-1">
-                <span class="px-2 py-0.5 rounded text-[10px] font-mono bg-amber-500/20 text-amber-300 border border-amber-500/30 font-semibold">/ip dhcp-client</span>
-                <h2 class="text-base font-bold text-white">DHCP Client Configuration</h2>
-              </div>
-              <p class="text-xs text-slate-400">RouterOS-style dynamic IP configuration on any physical interface, bridge or VLAN sub-interface.</p>
-            </div>
-            <div class="flex items-center gap-2">
-              <button onclick="openDHCPClientModal()" class="px-4 py-2 rounded-lg font-semibold text-xs bg-amber-500 hover:bg-amber-400 text-slate-950 shadow-lg shadow-amber-500/20 transition flex items-center gap-1.5">
-                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/></svg>
-                <span>Add DHCP Client</span>
-              </button>
-              <button onclick="loadDHCPClients(true)" class="p-2 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 border border-slate-700 transition" title="Refresh Telemetry">
-                <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/></svg>
-              </button>
-            </div>
+          <div class="flex items-center justify-between">
+            <button onclick="openDHCPClientModal()" class="px-4 py-2 rounded-lg font-semibold text-xs bg-amber-500 hover:bg-amber-400 text-slate-950 shadow-lg shadow-amber-500/20 transition flex items-center gap-1.5">
+              <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4"/></svg>
+              <span>+ Add</span>
+            </button>
           </div>
 
           <!-- KPI Summary Cards -->