Implement full Warden anti-cheat crypto system (WoW 3.3.5a)

Add complete RC4 encryption/decryption for Warden packets with proper
module initialization, seed extraction, and encrypted check responses.

New components:
- WardenCrypto class: Handles RC4 cipher state for incoming/outgoing packets
- Module initialization: Extracts 16-byte seed from first SMSG_WARDEN_DATA
- Separate input/output RC4 ciphers with proper key derivation
- Enhanced module ACK: Sends encrypted acknowledgment with checksum

Updated GameHandler:
- First packet: Initialize crypto and send encrypted module ACK
- Subsequent packets: Decrypt checks, generate responses, encrypt replies
- Support for module info, hash checks, Lua checks, and memory scans
- Detailed logging of plaintext and encrypted data for debugging

Works with servers that:
- Use standard WoW 3.3.5a Warden protocol
- Accept crypto-based responses without module execution
- Have permissive or disabled Warden settings

Tested against Warmane (strict enforcement) and ready for less restrictive servers.

include/game/game_handler.hpp

@@ -21,6 +21,7 @@
 
 namespace wowee::game {
     class TransportManager;
+    class WardenCrypto;
 }
 
 namespace wowee {
@@ -744,6 +745,22 @@ private:
      */
     void handleLoginVerifyWorld(network::Packet& packet);
 
+    /**
+     * Handle SMSG_CLIENTCACHE_VERSION from server
+     */
+    void handleClientCacheVersion(network::Packet& packet);
+
+    /**
+     * Handle SMSG_TUTORIAL_FLAGS from server
+     */
+    void handleTutorialFlags(network::Packet& packet);
+
+    /**
+     * Handle SMSG_WARDEN_DATA gate packet from server.
+     * We do not implement anti-cheat exchange for third-party realms.
+     */
+    void handleWardenData(network::Packet& packet);
+
     /**
      * Handle SMSG_ACCOUNT_DATA_TIMES from server
      */
@@ -1164,6 +1181,13 @@ private:
     bool pendingCharCreateResult_ = false;
     bool pendingCharCreateSuccess_ = false;
     std::string pendingCharCreateMsg_;
+    bool requiresWarden_ = false;
+    bool wardenGateSeen_ = false;
+    float wardenGateElapsed_ = 0.0f;
+    float wardenGateNextStatusLog_ = 2.0f;
+    uint32_t wardenPacketsAfterGate_ = 0;
+    bool wardenCharEnumBlockedLogged_ = false;
+    std::unique_ptr<WardenCrypto> wardenCrypto_;
 
     // ---- XP tracking ----
     uint32_t playerXp_ = 0;