Add Castle Siege & Guild Alliance ServerToClient packet definitions

[Copilot]

All C→S Castle Siege packets were already defined; this PR fills the gap by adding all S→C packet definitions to ServerToClientPackets.xml so the XSLT source generator produces the corresponding C# structs.

S→C Packets Added

B2 subcode group (C1HeaderWithSubCode) — direct responses mirror request subcodes:

• 00–07: Status, Registration, Unregister, RegistrationState, MarkRegistration, DefenseBuy, DefenseRepair, DefenseUpgrade responses
• 08–10: TaxInfo, TaxChange, TributeWithdraw responses
• 11–19: JoinSideNotification, GateOperateResponse, CrownStateUpdate, CrownAccessState, SwitchInfo, OwnershipChangeNotification, BattleStartEnd, RemainingTime, GateOperateState

B2 subcode group (C2HeaderWithSubCode) — variable-length list notifications:

• 1A: CastleSiegeMiniMapPlayerPositions — { x, y }[]
• 1B: CastleSiegeMiniMapNpcPositions — { npcType, x, y }[]

Other groups:

• B3-00: CastleSiegeGateState
• C2-B3-02: CastleSiegeNpcList — { npcNumber, npcIndex, defenseLevel, regenLevel, maxHp, hp, x, y, isAlive }[]
• C2-B4: CastleSiegeRegisteredGuildList — { guildName, markCount, registrationId, isCastleOwner }[]
• C2-B5: CastleSiegeGuildList — { side, isInvolved, guildName, score }[]
• B7-01–03, 05: MachineUseResult, MachineRegionNotify, MachineInterface, LifeStoneState
• B9-02: CastleOwnerLogo (32-byte binary logo)
• B9-03: HuntingZoneGuardInfo
• E6: GuildRelationshipChangeResponse
• C2-E9: AllianceList — { guildName, memberCount, guildMasterName }[]

Field Layout Conventions Used

• Multi-byte integers default to big-endian except NPC number/index fields, which use little-endian to match the corresponding C→S request packets
• Money/treasury fields use LongBigEndian (int64)
• Fixed-length strings use explicit <Length> matching protocol byte widths
• C2 packets carry IntegerBigEndian count fields; AllianceList uses a single-byte count per protocol spec

Generated Artifacts

The XSLT pre-build regenerated ServerToClientPackets.cs, ServerToClientPacketsRef.cs, ConnectionExtensions.cs, and 34 new docs/Packets/C*-by-server.md files.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Castle Siege Network Packets</issue_title>
<issue_description>## Summary

Define all Castle Siege and Guild Alliance network packet structures in the XML packet definition files. These definitions are used by the source generator to produce C# packet structs for both client→server and server→client communication.

Prerequisites

None — this phase is needed incrementally by all other phases. Can be done in parallel.

Background

OpenMU defines packets in XML files:

• Network/Packets/ClientToServer/ClientToServerPackets.xml
• Network/Packets/ServerToClient/ServerToClientPackets.xml

The source generator in Network/Packets/MUnique.OpenMU.Network.Packets.csproj reads these XML files and produces C# structs (e.g., CastleSiegeStatusRequest, CastleSiegeRegistrationResponse).

Existing Castle Siege packet documentation in docs/Packets/C1-B2-* provides field layouts.

Requirements

1. Verify/Complete Client→Server Packets

The following packets already exist in ClientToServerPackets.xml — verify they have complete field definitions matching the C++ reference:

Code	Name	Key Fields
C1-B2-00	CastleSiegeStatusRequest	(no fields)
C1-B2-01	CastleSiegeRegistrationRequest	(no fields)
C1-B2-02	CastleSiegeUnregisterRequest	(no fields)
C1-B2-03	CastleSiegeRegistrationStateRequest	(no fields)
C1-B2-04	CastleSiegeMarkRegistration	slot: byte (inventory slot)
C1-B2-05	CastleSiegeDefenseBuyRequest	npcType: int32, npcId: int32
C1-B2-06	CastleSiegeDefenseRepairRequest	npcType: int32, npcId: int32
C1-B2-07	CastleSiegeDefenseUpgradeRequest	npcType: int32, npcId: int32, upgradeType: int32
C1-B2-08	CastleSiegeTaxInfoRequest	(no fields)
C1-B2-09	CastleSiegeTaxChangeRequest	taxType: byte, taxRate: int32 (big-endian)
C1-B2-10	CastleSiegeTaxMoneyWithdraw	money: int32 (big-endian)
C1-B2-12	ToggleCastleGateRequest	operation: byte, gateIndex: uint16
C1-B2-1D	CastleGuildCommand	team: byte, x: byte, y: byte, command: byte
C1-B2-1F	CastleSiegeHuntingZoneEntranceSetting	enabled: byte
C1-B3-01	CastleSiegeGateListRequest	(no fields)
C1-B3-02	CastleSiegeStatueListRequest	(no fields)
C1-B4	CastleSiegeRegisteredGuildsListRequest	(no fields)
C1-B5	CastleOwnerListRequest	(no fields)
C1-B9-02	GuildLogoOfCastleOwnerRequest	(no fields)
C1-B9-05	CastleSiegeHuntingZoneEnterRequest	(no fields)
C1-E6	GuildRelationshipChangeRequest	targetGuildId: uint32, relationshipType: byte, requestType: byte
C1-E9	RequestAllianceList	(no fields)
C1-EB-01	RemoveAllianceGuildRequest	guildName: string

Add if missing:

Code	Name	Key Fields
C1-B7-??	CastleSiegeMachineUseRequest	npcIndex: uint16, targetZone: byte
C1-B7-??	CastleSiegeMachineDamageCallback	(impact coordinates, etc.)

2. Define Server→Client Packets

Add full XML definitions for all S→C packets in ServerToClientPackets.xml:

Name	Key Fields
CastleSiegeStatusResponse	result: byte, state: byte, startYear/Month/Day/Hour/Minute, endYear/Month/Day/Hour/Minute, siegeStartYear/Month/Day/Hour/Minute, guildName: string[8], guildMasterName: string[10], remainTime: int32
CastleSiegeRegistrationResponse	result: byte, guildName: string[8]
CastleSiegeUnregisterResponse	result: byte
CastleSiegeRegistrationStateResponse	guildName: string[8], marks: uint32, registrationId: int32
CastleSiegeMarkRegistrationResponse	result: byte, guildName: string[8], marks: uint32
CastleSiegeDefenseBuyResponse	result: byte, npcType: int32, npcId: int32
CastleSiegeDefenseRepairResponse	result: byte, npcType: int32, npcId: int32
CastleSiegeDefenseUpgradeResponse	result: byte, npcType: int32, npcId: int32, upgradeType: int32, upgradeValue: int32
CastleSiegeTaxInfoResponse	taxChaos: byte, taxStore: byte, taxHunt: int32, huntAllowed: byte, money: int64
CastleSiegeTaxChangeResponse	result: byte, taxType: byte, taxRate: int32
CastleSiegeTributeWithdrawResponse	result: byte, money: int64
CastleSiegeJoinSideNotification	side: byte
CastleSiegeCrownStateUpdate	state: byte (0=locked, 1=available)
CastleSiegeCrownAccessState	state: byte, accumulatedTimeMs: uint32
CastleSiegeSwitchInfo	switchIndex: uint16, switchId: byte, state: byte, joinSide: byte, guildName: string[9], userName: string[11]
CastleSiegeOwnershipChangeNotification	guildName: string[8]
`CastleSiegeBattleStartEnd...

• Fixes Castle Siege Network Packets #731

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