fix: mail money uint64, other-player cape textures, zone toast dedup, TCP_NODELAY

Mail: change money/COD fields from uint32 to uint64 in CMSG_SEND_MAIL and
SMSG_MAIL_LIST_RESULT for WotLK 3.3.5a. Classic keeps uint32 on the wire.
Fixes money truncation and packet misalignment causing mail failures.

Other-player capes: add cape texture loading to setOnlinePlayerEquipment().
The cape geoset was enabled but no texture was loaded, leaving capes blank.
Now mirrors the local-player path: looks up ItemDisplayInfo.dbc, finds cape
texture candidates, applies via setGroupTextureOverride/setTextureSlotOverride.

Zone toasts: suppress duplicate zone toast when the zone text overlay is
already showing the same zone name. Fixes double "Entering: Stormwind City".

Network: enable TCP_NODELAY on both auth and world sockets after connect(),
disabling Nagle's algorithm to eliminate up to 200ms buffering delay on
small packets (movement, spell casts, chat).

Rendering: track material and bone descriptor sets in M2 renderer to skip
redundant vkCmdBindDescriptorSets calls between batches sharing same textures.

src/network/tcp_socket.cpp

@@ -86,6 +86,11 @@ bool TCPSocket::connect(const std::string& host, uint16_t port) {
         }
     }
 
+    // Disable Nagle's algorithm — send small packets immediately.
+    int one = 1;
+    setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY,
+               reinterpret_cast<const char*>(&one), sizeof(one));
+
     connected = true;
     LOG_INFO("Connected to ", host, ":", port);
     return true;

src/network/world_socket.cpp

@@ -220,6 +220,11 @@ bool WorldSocket::connect(const std::string& host, uint16_t port) {
         }
     }
 
+    // Disable Nagle's algorithm — send small packets immediately.
+    int one = 1;
+    setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY,
+               reinterpret_cast<const char*>(&one), sizeof(one));
+
     connected = true;
     LOG_INFO("Connected to world server: ", host, ":", port);
     startAsyncPump();