feat: interactive password input for pass_mgr admin init

- Remove --key-path parameter requirement
- Add interactive password prompt (hidden input like sudo)
- Require password confirmation
- Password must be at least 6 characters
- Uses golang.org/x/term for secure password input

pass_mgr/go.mod

@@ -1,10 +1,12 @@
 module pass_mgr
 
-go 1.22
+go 1.24.0
 
 require github.com/spf13/cobra v1.8.0
 
 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
 )