fix: pass chat_action from target config to Telegram client

chat_action was stored on NotificationTarget model but never injected
into the config dict passed to the dispatcher. Now injected in both
watcher and webhook handler, and read by the dispatcher to pass to
TelegramClient.send_notification().

packages/server/src/notify_bridge_server/services/watcher.py

@@ -176,6 +176,9 @@ async def check_tracker(tracker_id: int) -> dict[str, Any]:
                         template_slots[event_key] = tmpl_text
 
             target_config = dict(target.config)
+            # Inject chat_action for Telegram targets
+            if hasattr(target, 'chat_action') and target.chat_action:
+                target_config["chat_action"] = target.chat_action
             # Inject bot credentials for bot-backed target types
             if target.type == "email":
                 email_bot_id = target.config.get("email_bot_id")