docs: update daemon CLI syntax from flags to subcommands

Update all documentation to use the new subcommand syntax:
- `bd daemon --start` → `bd daemon start`
- `bd daemon --stop` → `bd daemon stop`
- `bd daemon --status` → `bd daemon status`
- `bd daemon --health` → `bd daemon status --all`
- `--global=false` → `--local`

The old flag syntax is deprecated but still works with warnings.

Closes: bd-734vd

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

examples/monitor-webui/README.md

@@ -231,7 +231,7 @@ Make sure you've initialized a beads database with `bd init` or specify the data
 The monitor requires the daemon to avoid SQLite locking conflicts. Start the daemon first:
 
 ```bash
-bd daemon
+bd daemon start
 ```
 
 ### WebSocket disconnects frequently

examples/monitor-webui/main.go

@@ -158,7 +158,7 @@ func connectToDaemon(socketPath, dbPath string) error {
 		if health.Error != "" {
 			errMsg += fmt.Sprintf("\nError: %s", health.Error)
 		}
-		return fmt.Errorf("%s\n\nTry restarting the daemon:\n  bd daemon stop\n  bd daemon", errMsg)
+		return fmt.Errorf("%s\n\nTry restarting the daemon:\n  bd daemon stop\n  bd daemon start", errMsg)
 	}
 
 	// Set database path