feat: commande d'installation agent dans la config serveur

Nouvelle section "INSTALLATION AGENT" en bas du popup de configuration :
champ lecture seule avec la commande curl pré-remplie (SERVER_IP auto
depuis window.location.hostname) + bouton Copier.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dashboard/js/popups.js

@@ -305,6 +305,21 @@ const Popups = (() => {
                 ${[[15,'15 min'],[30,'30 min'],[60,'1 heure'],[360,'6 heures']].map(([v,l]) =>
                   `<option value="${v}" ${(cfg.chart_duration_min??30)==v?'selected':''}>${l}</option>`).join('')}
               </select></div>
+          </div>
+          <div style="display:flex;flex-direction:column;gap:8px">
+            <div class="scfg-sec-title">INSTALLATION AGENT</div>
+            <div class="scfg-row" style="flex-direction:column;align-items:stretch;gap:6px">
+              <label style="font-size:0.85em;color:var(--fg2)">Commande curl — copiez et lancez en root sur la machine cible</label>
+              <div style="display:flex;gap:6px;align-items:center">
+                <input type="text" id="s-install-cmd" readonly
+                  style="flex:1;font-family:var(--font-mono);font-size:0.78em;padding:6px 8px;
+                         background:var(--bg2);border:1px solid var(--border);border-radius:6px;
+                         color:var(--fg);cursor:text;min-width:0"
+                  value="SERVER_IP=${window.location.hostname} curl -fsSL https://git.maison43gil.com/gilles/nano_metrics/raw/branch/main/deploy/install.sh | sudo bash">
+                <button class="btn" style="padding:5px 10px;font-size:0.8em;white-space:nowrap"
+                  onclick="navigator.clipboard.writeText(document.getElementById('s-install-cmd').value).then(()=>{this.textContent='✓ Copié';setTimeout(()=>this.textContent='Copier',1500)})">Copier</button>
+              </div>
+            </div>
           </div>`;
         document.getElementById('overlay-srvcfg').style.display = 'flex';
     }