Add server info commands: /time, /played, and /who

- Add CMSG_QUERY_TIME (0x1CE) and SMSG_QUERY_TIME_RESPONSE (0x1CF) opcodes
- Add CMSG_REQUEST_PLAYED_TIME (0x1CC) and SMSG_PLAYED_TIME (0x1CD) opcodes
- Add CMSG_WHO (0x062) and SMSG_WHO (0x063) opcodes
- Implement /time command to query and display server time
- Implement /played command to show total and level playtime statistics
- Implement /who [name] command to list online players with level and guild
- Add packet builders: QueryTimePacket, RequestPlayedTimePacket, WhoPacket
- Add response parsers for all three server info packet types
- Add handlers that format and display responses in chat as system messages
- Format played time as "X days, Y hours, Z minutes" for readability
- Format server time as "YYYY-MM-DD HH:MM:SS" for readability

include/game/world_packets.hpp

@@ -648,6 +648,58 @@ public:
  */
 const char* getChatTypeString(ChatType type);
 
+// ============================================================
+// Server Info Commands
+// ============================================================
+
+/** CMSG_QUERY_TIME packet builder */
+class QueryTimePacket {
+public:
+    static network::Packet build();
+};
+
+/** SMSG_QUERY_TIME_RESPONSE data */
+struct QueryTimeResponseData {
+    uint32_t serverTime = 0;  // Unix timestamp
+    uint32_t timeOffset = 0;  // Time until next daily reset
+};
+
+/** SMSG_QUERY_TIME_RESPONSE parser */
+class QueryTimeResponseParser {
+public:
+    static bool parse(network::Packet& packet, QueryTimeResponseData& data);
+};
+
+/** CMSG_REQUEST_PLAYED_TIME packet builder */
+class RequestPlayedTimePacket {
+public:
+    static network::Packet build(bool sendToChat = true);
+};
+
+/** SMSG_PLAYED_TIME data */
+struct PlayedTimeData {
+    uint32_t totalTimePlayed = 0;  // Total seconds played
+    uint32_t levelTimePlayed = 0;  // Seconds played at current level
+    bool triggerMessage = false;   // Whether to show in chat
+};
+
+/** SMSG_PLAYED_TIME parser */
+class PlayedTimeParser {
+public:
+    static bool parse(network::Packet& packet, PlayedTimeData& data);
+};
+
+/** CMSG_WHO packet builder */
+class WhoPacket {
+public:
+    static network::Packet build(uint32_t minLevel = 0, uint32_t maxLevel = 0,
+                                 const std::string& playerName = "",
+                                 const std::string& guildName = "",
+                                 uint32_t raceMask = 0xFFFFFFFF,
+                                 uint32_t classMask = 0xFFFFFFFF,
+                                 uint32_t zones = 0);
+};
+
 // ============================================================
 // Phase 1: Foundation — Targeting, Name Queries
 // ============================================================