feat: Gear sharing

[ShadowCat117]

Based on #13

[Copilot]

Pull Request Overview

This PR implements gear sharing functionality by adding equipment item fields to the network protocol packets used for mutual friend updates and status reporting.

• Adds equipment fields (helmet, chestplate, leggings, boots, rings, bracelet, necklace, heldItem) to packet structures
• Implements backward compatibility for packet serialization/deserialization
• Extends the SocialType enum to include GUILD members

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
HSPacketUpdateMutual.java	Adds equipment fields and constructors with backward-compatible serialization
HCPacketUpdateStatus.java	Adds equipment fields and constructors with backward-compatible serialization
SocialType.java	Adds GUILD enum value to support guild member social type

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