fix: use PaddedCell as plugin id to match directory name

- Change plugin id from 'padded-cell' to 'PaddedCell'
- Update manifest and install script
- OpenClaw infers plugin id from directory name

pass_mgr/go.mod

@@ -2,11 +2,13 @@ module pass_mgr
 
 go 1.24.0
 
-require github.com/spf13/cobra v1.8.0
+require (
+	github.com/spf13/cobra v1.8.0
+	golang.org/x/term v0.40.0
+)
 
 require (
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	golang.org/x/sys v0.41.0 // indirect
-	golang.org/x/term v0.40.0 // indirect
 )