feat(monitor): add ping, port, and DNS check routines

Implement checkPing (pro-bing ICMP), checkPort (TCP dial), and checkDNS
(miekg/dns) with per-monitor timeout, configurable DNS record types,
and fallback defaults. Groups skip checks entirely.

go.mod

@@ -5,12 +5,17 @@ go 1.24.4
 require (
 	github.com/charmbracelet/bubbles v0.21.1-0.20250623103423-23b8fd6302d7
 	github.com/charmbracelet/bubbletea v1.3.10
+	github.com/charmbracelet/harmonica v0.2.0
+	github.com/charmbracelet/huh v1.0.0
 	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/charmbracelet/ssh v0.0.0-20250826160808-ebfa259c7309
 	github.com/charmbracelet/wish v1.4.7
 	github.com/lib/pq v1.11.1
+	github.com/lrstanley/bubblezone v1.0.0
 	github.com/mattn/go-isatty v0.0.20
 	github.com/mattn/go-sqlite3 v1.14.33
+	github.com/miekg/dns v1.1.72
+	github.com/prometheus-community/pro-bing v0.8.0
 )
 
 require (
@@ -19,8 +24,6 @@ require (
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/charmbracelet/colorprofile v0.3.1 // indirect
-	github.com/charmbracelet/harmonica v0.2.0 // indirect
-	github.com/charmbracelet/huh v1.0.0 // indirect
 	github.com/charmbracelet/keygen v0.5.3 // indirect
 	github.com/charmbracelet/log v0.4.2 // indirect
 	github.com/charmbracelet/x/ansi v0.10.1 // indirect
@@ -36,7 +39,7 @@ require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/go-logfmt/logfmt v0.6.0 // indirect
-	github.com/lrstanley/bubblezone v1.0.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
@@ -45,10 +48,13 @@ require (
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/sahilm/fuzzy v0.1.1 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
-	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/crypto v0.47.0 // indirect
 	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
-	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/text v0.24.0 // indirect
+	golang.org/x/mod v0.31.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/text v0.33.0 // indirect
+	golang.org/x/tools v0.40.0 // indirect
 )