fix(cli): add --header flag to all CLI subcommands that make RPC calls

[whoAbhishekSah]

Summary

Many CLI subcommands that make RPC calls are missing the --header / -H flag, making it impossible to pass authentication headers (e.g., session cookies). Only create subcommands and preferences commands currently support it.

Affected commands

Command	create	list	view	edit
organization	-H	missing	missing	missing
project	-H	missing	missing	missing
group	-H	missing	missing	missing
user	-H	missing	missing	missing
role	-H	missing	missing	missing
permission	-H	missing	missing	missing
policy	-H	missing	-	missing
namespace	-	missing	missing	-
preferences	-	-H	-H	-H

Expected behavior

All subcommands that make RPC calls should support --header / -H for passing authentication headers:

./frontier organization list -H "Cookie:sid=<session>"
./frontier user view <id> -H "Cookie:sid=<session>"
./frontier namespace list -H "Cookie:sid=<session>"

---

🤖 Generated with Claude Code