fix: update TalkService for Talk 14 compatibility and add CLI copy helper

- **TalkService**:
  - Refactored `ensureBotParticipants` to use `AttendeeMapper` directly, removing the dependency on `ParticipantService`.
  - Added `getBotDisplayNameForRoom` to resolve the bot's display name via direct DB query.
  - Updated `sendMessage` to use Chat API v1 and include `richObjectsEnd`.
  - Improved `getBaseUrl` logic to handle `overwritehost` and `overwritewebroot`.
- **WebhookController**:
  - Fixed `getAllValues` to iterate known keys manually, preventing `RuntimeException` in Nextcloud 33.
  - Added error handling for `saveConfig`.
  - Removed unused `ParticipantService` import.
- **js/settings.js**:
  - Added functionality to copy CLI commands to the clipboard.
- **Deletions**:
  - Removed `lib/Command/AddBotParticipant.php` as its logic is now integrated into `TalkService`.
- **Templates**:
  - Updated admin settings labels and comments.

templates/adminSettings.php

@@ -1,6 +1,6 @@
 <div class="nc-settings-section">
-    <h3>Bot Configuration</h3>
-    <label for="nc-bot-password"><strong>Bot App Password</strong></label><br>
+    <h3>Bot App Password</h3>
+    <label for="nc-bot-password"><strong>Enter bot app password</strong></label><br>
     <div style="display: flex; gap: 8px; align-items: center; margin: 8px 0;">
         <input type="password" id="nc-bot-password" placeholder="<?= $hasBotPassword ? '●●●●●●●● (leave blank to keep current)' : 'Paste talk-bot app password here' ?>" style="flex: 1; padding: 8px; font-size: 1em;">
         <button id="nc-save-password" type="button" style="display: <?= $hasBotPassword ? 'none' : 'inline-block' ?>;">Save</button>