Updated chat handler to use the MessageType enum values instead of numbers

Added local_id tracking for the packet service
Added mob spawning packet in response to game logic events (only for a NearbyUpdate event right now)

packet-service/src/connection_state.rs

@@ -13,8 +13,9 @@ pub struct ConnectionState {
     pub character_id: Option<i8>,
     pub character_name: Option<String>,
     pub character_list: Option<Vec<u32>>,
-    pub additional_data: HashMap<String, String>, // Flexible data storage
+    pub additional_data: HashMap<String, String>,
     pub client_id: u16,
+    pub local_id: u16, // Local connection ID for packet routing
     pub chat_handler: Option<Arc<ChatClientHandler>>,
     pub writer: Option<Arc<tokio::sync::Mutex<WriteHalf<TcpStream>>>>,
 }
@@ -29,6 +30,7 @@ impl ConnectionState {
             character_list: None,
             additional_data: HashMap::new(),
             client_id: 0,
+            local_id: 0,
             chat_handler: None,
             writer: None,
         }