feat: add zalouser channel + directory CLI (#1032) (thanks @suminhthanh)

- Unified UX: channels login + message send; no plugin-specific top-level command\n- Added generic directory CLI for channel identity/groups\n- Docs: channel + plugin pages

docs/docs.json

@@ -792,6 +792,7 @@
           "cli/health",
           "cli/sessions",
           "cli/channels",
+          "cli/directory",
           "cli/skills",
           "cli/plugins",
           "cli/memory",
@@ -907,6 +908,7 @@
           "channels/msteams",
           "channels/matrix",
           "channels/zalo",
+          "channels/zalouser",
           "broadcast-groups",
           "channels/troubleshooting",
           "channels/location"
@@ -945,6 +947,7 @@
           "tools",
           "plugin",
           "plugins/voice-call",
+          "plugins/zalouser",
           "tools/exec",
           "tools/web",
           "tools/apply-patch",