Client Commands: telegram-panel slash commands with Discord-style parameters

Lists the panel account's client commands as Telegram slash commands (hourly
refresh, cached on the device), shows their parameters while typing, runs
complete commands on the panel instead of sending them and shows the answer
as an "Only visible to you" message (latest 20 kept in memory). Holding send
offers Run / Send as message / Send response in chat (red ! badge); an
answer's menu starts with Send in chat. Other plugins register their own
commands through the client_commands library module.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/development.md

@@ -16,9 +16,13 @@
 ```
 plugin.json         single source of truth for plugin metadata
 src/                the plugin, written as an ordinary Python package
-  main.py           entry module — exactly one BasePlugin subclass, absolute imports only
-  greeting/         sample package (proves relative + cross-module imports survive bundling)
-  textutil.py       sample top-level sibling module
+  main.py           entry module: the plugin class, settings, the send hook
+  api.py            telegram-panel client API (/api/v1/client/commands)
+  catalog.py        each account's commands: the panel's (hourly, cached on disk) + plugins'
+  library.py        the `client_commands` module other plugins register commands with
+  runner.py         runs a command on the panel or on the device, shows or sends the response
+  commands/         pure Python, tested offline: model, parser (in step with the panel's), HTML
+  hooks/            the app's UI: suggestion list, message field, local responses
 tools/
   bundle.py         compiles plugin.json + src/ into dist/<id>.plugin
   devclient.py      speaks the on-device dev-server protocol (127.0.0.1:42690)