feat(dashboard): métriques chargées immédiatement au rechargement de page

GET /api/agents inclut désormais last_metrics (dernière ligne de la table
metrics) pour chaque agent. grid.js l'utilise lors du refresh initial, ce
qui peuple les tuiles sans attendre le prochain message WebSocket.

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

dashboard/js/grid.js

@@ -124,7 +124,7 @@ const Grid = (() => {
     function refresh(agents) {
         agents.forEach(a => {
             if (!_agents.has(a.id)) {
-                _agents.set(a.id, { agent: a, metrics: null });
+                _agents.set(a.id, { agent: a, metrics: a.last_metrics || null });
             } else {
                 _agents.get(a.id).agent = a;
             }

server/db/db.go

@@ -128,6 +128,53 @@ func (d *DB) GetAgents() ([]models.Agent, error) {
 	return agents, nil
 }
 
+func (d *DB) GetLastMetrics(agentID string) (*models.AgentMetrics, error) {
+	var cpu, temperature *float64
+	var memUsed, memFree, memTotal, hddUsed, hddFree, hddTotal *int64
+	var uptime, netRX, netTX *int64
+	var smartPassed, smartTemp, smartRealloc, smartHours, smartWear *int64
+
+	err := d.conn.QueryRow(`
+		SELECT cpu_percent, memory_used, memory_free, memory_total,
+		       hdd_used, hdd_free, hdd_total,
+		       uptime, network_rx, network_tx, temperature,
+		       smart_passed, smart_temp, smart_realloc, smart_hours, smart_wear
+		FROM metrics WHERE agent_id = ? ORDER BY ts DESC LIMIT 1`, agentID).
+		Scan(&cpu, &memUsed, &memFree, &memTotal,
+			&hddUsed, &hddFree, &hddTotal,
+			&uptime, &netRX, &netTX, &temperature,
+			&smartPassed, &smartTemp, &smartRealloc, &smartHours, &smartWear)
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	m := &models.AgentMetrics{
+		CPUPercent:  cpu,
+		MemoryUsed:  memUsed,
+		MemoryFree:  memFree,
+		MemoryTotal: memTotal,
+		HDDUsed:     hddUsed,
+		HDDFree:     hddFree,
+		HDDTotal:    hddTotal,
+		Uptime:      uptime,
+		NetworkRX:   netRX,
+		NetworkTX:   netTX,
+		Temperature: temperature,
+	}
+	if smartPassed != nil {
+		m.Smart = &models.SmartMetrics{
+			Passed:             *smartPassed == 1,
+			Temperature:        smartTemp,
+			ReallocatedSectors: smartRealloc,
+			PowerOnHours:       smartHours,
+			WearLevel:          smartWear,
+		}
+	}
+	return m, nil
+}
+
 func (d *DB) GetMetricsHistory(agentID string, from, to int64) ([]map[string]interface{}, error) {
 	rows, err := d.conn.Query(`
 		SELECT ts, cpu_percent, memory_used, memory_total, hdd_used, hdd_total

server/handlers/agents.go

@@ -15,6 +15,9 @@ func AgentsHandler(database *db.DB) http.HandlerFunc {
 			http.Error(w, err.Error(), 500)
 			return
 		}
+		for i := range agents {
+			agents[i].LastMetrics, _ = database.GetLastMetrics(agents[i].ID)
+		}
 		w.Header().Set("Content-Type", "application/json")
 		json.NewEncoder(w).Encode(agents)
 	}