feat(bot): refactor webhook parsing for better structure

- Updated webhook parsing to align with the latest Nextcloud Talk Bot format.
- Improved handling of actor, message, and conversation data for clarity and flexibility.
- Added robust JSON decoding with fallback for content extraction.

systems/x86_64-linux/mx/nextcloud-claude-bot/bot.py

@@ -214,28 +214,38 @@ async def handle_webhook(
     
     log.info(f"Received webhook: {json.dumps(data, indent=2)[:500]}")
 
-    # Extract message info
-    # Nextcloud Talk Bot API structure
+    # Extract message info - Nextcloud Talk Bot webhook format
     actor = data.get("actor", {})
-    actor_id = actor.get("id", "")
     actor_type = actor.get("type", "")
+    actor_id_full = actor.get("id", "")  # e.g., "users/harald"
 
-    message_data = data.get("message", {})
-    message_text = message_data.get("message", "")
-    message_id = message_data.get("id")
+    # Extract username from "users/username" format
+    if "/" in actor_id_full:
+        actor_id = actor_id_full.split("/", 1)[1]
+    else:
+        actor_id = actor_id_full
 
-    conversation = data.get("conversation", {})
-    conversation_token = conversation.get("token", "")
-    conversation_type = conversation.get("type", 0)
+    # Message is in object.content as JSON string
+    obj = data.get("object", {})
+    message_id = obj.get("id")
+    content_str = obj.get("content", "{}")
+    try:
+        content = json.loads(content_str)
+        message_text = content.get("message", "")
+    except json.JSONDecodeError:
+        message_text = content_str
 
-    # Only respond to user messages
-    if actor_type != "users":
+    # Conversation info is in target
+    target = data.get("target", {})
+    conversation_token = target.get("id", "")
+
+    # Only respond to user/person messages
+    if actor_type not in ("users", "Person"):
         log.info(f"Ignoring non-user actor: {actor_type}")
         return JSONResponse({"status": "ignored", "reason": "not a user message"})
 
-    # For group chats (type 2, 3, 4), only respond if bot is mentioned
-    # Type 1 = one-to-one, Type 2 = group, Type 3 = public, Type 4 = changelog
-    is_direct_message = conversation_type == 1
+    # For now, treat all conversations the same (respond to mentions)
+    is_direct_message = False  # We can't easily determine this from the webhook
 
     # Check for bot mention in message (Nextcloud uses @"Bot Name" format)
     bot_mentioned = False