Server statistics, multi-view record commands, and rc.3 fixes

Added:
- Server statistics: named's memory and CPU (from /proc), cache size,
  sockets and client counts against their limits (statistics channel,
  rndc status), host memory and load, and free disk space. Memory and
  CPU are kept over time as gauges (sum and sample count, averaged in
  timelines). Statistics page Server section, jarl stats server,
  GET /stats/server.
- jarl record add|set|delete|disable|enable --view a,b | all: the same
  change in each view, applied as one changeset.
- Blocking can be paused until resumed (jarl block pause indefinitely,
  "Until I resume", {"indefinitely": true}).

Changed:
- List options (allow-transfer, forwarders, ...) get their braces added
  when given without them.
- The dashboard lists named-checkconf's warnings about the running
  configuration; the CLI prints them after an apply.
- Stats page: tile and card rows fill their width, and the queries and
  failed answers charts share margins so their time axes line up.
- Dashboard: options have their own tile.
- 24-hour times in the web UI.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/model/model.go

@@ -214,7 +214,15 @@ type Settings struct {
 	// BlockingPausedUntil, while set, lets every name through blocking
 	// (docs/blocking.md); jarld clears it when the time is up.
 	BlockingPausedUntil *time.Time `json:"blocking_paused_until,omitempty"`
-	Version             int        `json:"version"`
+	// BlockingPausedIndefinitely pauses blocking until someone resumes it.
+	BlockingPausedIndefinitely bool `json:"blocking_paused_indefinitely,omitempty"`
+	Version                    int  `json:"version"`
+}
+
+// BlockingPaused reports whether blocking is paused, for a time or until
+// resumed.
+func (s *Settings) BlockingPaused() bool {
+	return s.BlockingPausedUntil != nil || s.BlockingPausedIndefinitely
 }
 
 // DefaultSettings returns the settings of a fresh installation.