Add Tier 1 utility commands: ignore, sit/stand, and logout

Ignore Commands:
- Add /ignore <name> to block messages from players
- Add /unignore <name> to unblock players
- Maintain ignoreCache for name-to-GUID lookups
- Show confirmation and error messages for ignore actions
- Use CMSG_ADD_IGNORE (0x6C) and CMSG_DEL_IGNORE (0x6D)

Sit/Stand/Kneel Commands:
- Add /sit to sit down (stand state 1)
- Add /stand to stand up (stand state 0)
- Add /kneel to kneel (stand state 8)
- Instant visual feedback with CMSG_STAND_STATE_CHANGE (0x101)
- Support for additional stand states (chair, sleep, etc.)

Logout Commands:
- Add /logout and /camp to initiate logout with countdown
- Add /cancellogout to cancel pending logout
- Show "Logging out in 20 seconds..." or "Logout complete" messages
- Track logout state with loggingOut_ flag to prevent duplicate requests
- Handle instant logout (in inn/city) vs countdown logout
- Use opcodes:
  - CMSG_LOGOUT_REQUEST (0x4B)
  - CMSG_LOGOUT_CANCEL (0x4E)
  - SMSG_LOGOUT_RESPONSE (0x4C)
  - SMSG_LOGOUT_COMPLETE (0x4D)

Implementation:
- Add LogoutRequestPacket, LogoutCancelPacket builders
- Add LogoutResponseParser to parse server logout responses
- Add StandStateChangePacket builder for stance changes
- Add AddIgnorePacket and DelIgnorePacket for ignore list management
- Add handleLogoutResponse() and handleLogoutComplete() handlers
- Add ignoreCache map and loggingOut_ state tracking
- All commands display feedback in chat window

include/game/opcodes.hpp

@@ -71,6 +71,16 @@ enum class Opcode : uint16_t {
     CMSG_ADD_IGNORE                  = 0x06C,
     CMSG_DEL_IGNORE                  = 0x06D,
 
+    // ---- Logout Commands ----
+    CMSG_PLAYER_LOGOUT               = 0x04A,
+    CMSG_LOGOUT_REQUEST              = 0x04B,
+    CMSG_LOGOUT_CANCEL               = 0x04E,
+    SMSG_LOGOUT_RESPONSE             = 0x04C,
+    SMSG_LOGOUT_COMPLETE             = 0x04D,
+
+    // ---- Stand State ----
+    CMSG_STAND_STATE_CHANGE          = 0x101,
+
     // ---- Random Roll ----
     MSG_RANDOM_ROLL                  = 0x1FB,