feat(telegram,discord): inline buttons for permission approval (#945)

Replace "Reply 'yes abcde' to allow" text instruction with native
inline buttons (Telegram InlineKeyboard, Discord ButtonBuilder).
One tap to approve/deny instead of typing a 5-char ID.

- Telegram: callback_query handler with allowFrom gate, edits message
  to show outcome and remove buttons after decision
- Discord: interactionCreate handler with allowFrom gate, updates
  interaction with outcome and clears components
- Text-reply path (PERMISSION_REPLY_RE) kept as fallback
- Bump both plugins to v0.0.3

🏠 Remote-Dev: homespace

external_plugins/telegram/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "telegram",
   "description": "Telegram channel for Claude Code \u2014 messaging bridge with built-in access control. Manage pairing, allowlists, and policy via /telegram:access.",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "keywords": [
     "telegram",
     "messaging",