refactor(models): typed Status constants with IsBroken() predicate

Replace ~150 bare status string comparisons with typed models.Status
constants (StatusUp, StatusDown, StatusPending, StatusLate, StatusStale,
StatusSSLExp). Single IsBroken() method replaces the duplicated
isBroken lambda in monitor.go and isDown function in sla.go.

Adding a new status value (e.g. DEGRADED) now requires one constant
definition instead of grep-and-pray across 16 files.

CheckResult.Status stays string — the checker is the boundary between
raw protocol results and typed status. Cast happens at the edge in
handleStatusChange.

internal/tui/format_test.go

@@ -56,19 +56,19 @@ func TestSiteOrder(t *testing.T) {
 
 func TestFmtStatus(t *testing.T) {
 	tests := []struct {
-		status  string
+		status  models.Status
 		paused  bool
 		inMaint bool
 		wantSub string
 	}{
-		{"DOWN", false, false, "▼ DOWN"},
-		{"UP", false, false, "▲ UP"},
-		{"SSL EXP", false, false, "▼ SSL EXP"},
-		{"LATE", false, false, "◆ LATE"},
-		{"STALE", false, false, "◆ STALE"},
-		{"PENDING", false, false, "○ PENDING"},
-		{"DOWN", true, false, "◇ PAUSED"},
-		{"DOWN", false, true, "◼ MAINT"},
+		{models.StatusDown, false, false, "▼ DOWN"},
+		{models.StatusUp, false, false, "▲ UP"},
+		{models.StatusSSLExp, false, false, "▼ SSL EXP"},
+		{models.StatusLate, false, false, "◆ LATE"},
+		{models.StatusStale, false, false, "◆ STALE"},
+		{models.StatusPending, false, false, "○ PENDING"},
+		{models.StatusDown, true, false, "◇ PAUSED"},
+		{models.StatusDown, false, true, "◼ MAINT"},
 	}
 	for _, tt := range tests {
 		got := styledModel.fmtStatus(tt.status, tt.paused, tt.inMaint)