v0.0.9: Group management — leave, kick, members

Server:
- POST /groups/:name/leave — remove self from group
- POST /groups/:name/kick — creator can kick members
- GET /groups/:name/members — list with aliases + creator badge

CLI TUI:
- /gleave — leave current group
- /gkick <fp_or_alias> — kick (creator only)
- /gmembers — show member list with aliases and ★ for creator

Web client:
- Same commands: /gleave, /gkick, /gmembers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.8"
+version = "0.0.9"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"