Add fleet ops dashboard, Calibrate enforcement, and dead-code cleanup.

Ship live alerts, pool status, AI monitor, remote agent commands, build manager, and uninstall flow; wire Calibrate settings (WS ping, pool traffic log, retention limits) at runtime and exclude server/data from git.

server/internal/alerts/evaluator_test.go

@@ -0,0 +1,40 @@
+package alerts
+
+import (
+	"testing"
+	"time"
+
+	"crypto-miner-server/internal/models"
+)
+
+func TestFormatPct(t *testing.T) {
+	if formatPct(50.55) != "50.5" {
+		t.Fatalf("expected 50.5 got %s", formatPct(50.55))
+	}
+}
+
+func TestEvaluatorOfflineAlert(t *testing.T) {
+	var fired []AlertEvent
+	e := &Evaluator{
+		thresholds: func() Thresholds { return Thresholds{OfflineMinutes: 5} },
+		broadcast:  func(ev AlertEvent) { fired = append(fired, ev) },
+		baseline:   make(map[string]float64),
+		lastFired:  make(map[string]time.Time),
+		cooldown:   0,
+	}
+
+	agent := &models.Agent{
+		ID:       "a1",
+		Name:     "worker-1",
+		Status:   "offline",
+		LastSeen: time.Now().Add(-10 * time.Minute),
+	}
+
+	e.checkOffline(agent, e.thresholds(), time.Now())
+	if len(fired) != 1 {
+		t.Fatalf("expected 1 alert, got %d", len(fired))
+	}
+	if fired[0].Type != "offline" {
+		t.Fatalf("expected offline alert")
+	}
+}