Add the Raklion event (Battle of Selupan)

[apraxico]

Part of #23.

Summary

The Raklion hatchery (map 58) now runs the Selupan event, like the original game:

1. The 15 spider eggs appear in the hatchery. When only a few are left, the clients are notified.
2. When all eggs are destroyed, Selupan appears after 5 seconds and falls from the sky.
3. 5 minutes after Selupan appeared, the hatchery gate is closed. Only the players inside can fight.
4. The battle ends when Selupan is killed, or when all players of the battle died or left.
5. The hatchery opens again after 12 hours, and the spider eggs appear again.

All times and values are configurable in the admin panel (plugin "Raklion Event").

Selupan

SelupanIntelligence uses a skill every 1.5 seconds. Its pattern (1 to 7) depends on its remaining health
(80/60/50/40/20/10 %). With each pattern, it gets additional damage (berserk) and more skills:

Skill	From pattern	Effect
Poison, Ice Storm, Ice Strike	1	Hits the players around the target
Teleport	1	Vanishes and appears 3 to 6 fields away
Freeze	2	Hits and stuns the target
Heal	4	Heals 5 % of its current health
Summon	5	Summons the missing Coolutins
Invincibility	7	Doesn't receive damage for 10 seconds

Simplifications: the poison and ice skills deal the normal damage of Selupan in an area, without a poison
damage over time or pushing the players back.

Hatchery access

Like the original game, only players which entered the hatchery while it was open may stay there. Others,
e.g. players entering while it's closed, are moved to the entrance of Raklion. After the battle, the remaining
players are moved out after a configurable time (PlayerRemovalDelay, 5 minutes by default). Unlike the
original game, game masters aren't exempt from these rules.

Changes

• GameLogic: RaklionPlugIn (feature plugin with periodic task and custom configuration), RaklionContext
  (state machine), SelupanIntelligence, RaklionEventDefinition, IRaklionEventViewPlugIn.
• Monster.TeleportAsync: new public method, so that a monster can be teleported (MoveType.Teleport)
  instead of moved instantly, which the client shows as sliding.
• Packets: S2C D1 10 (state info), D1 11 (current state), D1 12 (state change), D1 13 (battle result)
  and 69 (monster skill animation, used for the skills of Selupan). The structures of the client aren't
  packed, so some fields are aligned (documented in the packet descriptions).
• GameServer: RaklionEventViewPlugIn and the handler of the C2S D1 10 request, which was defined but unhandled.
• Data: the monster spawns of the hatchery are spawned by the event, in waves: 1 = spider eggs,
  2 = Selupan, 3 = Coolutins summoned by Selupan. They were automatic spawns before.
• Update plugin AddRaklionEventUpdatePlugIn (version 116, mandatory, idempotent): changes the automatic
  spawns of the hatchery of existing databases to the waves. Without it, the event doesn't start and logs one warning.
• Messages: the texts of the original game, shown to all players of the server like the original. Additionally,
  the result of the battle and the time until the hatchery opens are shown in one new message, which is also written
  to the chat, so that they don't replace each other on the screen.

Drops of Selupan are left to the configuration of each server (drop groups), like the difficulty.

Notes

• The behavior and the default values (times, egg count, pattern thresholds, spawn coordinates) follow the
  configuration of public server files (IGCN). No code was copied or converted.
• The client only uses D1 10-D1 12; it ignores D1 13, which is sent for completeness.
• MonsterSkillAnimation (0x69): the client searches the target by its id as it is, so the flag for a successful
  skill (highest bit of the target id) isn't set.

Tests

• Packets (Network.Packets.Tests), view plugin serialization, pattern/berserk/skill selection of the definition,
  data of a new database, and the update plugin (applied twice).
• Tested in game: eggs, appearance, the skills with their animations, summons, killing Selupan, the failed battle
  (all players died or left), the messages, the closed hatchery after the battle, the removal of the players and
  the reopening.

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🤖 Generated with Claude Code

[apraxico]

The Codacy findings are addressed, except S1128 (unnecessary using) for System.Collections.Concurrent in RaklionContext.cs and RaklionPlugIn.cs, which looks like a false positive, like in #973: removing it breaks the build (CS0246, ConcurrentDictionary<,> isn't covered by a global using).

The Azure build fails within 0 seconds, like on master and on the previous PRs, so it's the known issue of the build infrastructure.

[ze-dom]

Hey there!
It seems to me that the Selupan's skill multipliers are missing.

You can see in this source that:
| Skill | Multip | Description |
| 250 | 2.0 | Poison Attack |
| 251 | 2.2 | Ice Storm |
| 252 | 2.3 | Ice Strike |
| 253 | 2.5 | "First Skill" (this is probably when he falls from the sky) |

There is already a base skill multiplier of 2 in OpenMU.
If you add these, you can clear the comment on RaklionBoss.cs. If you don't, this stays for the record :).
If these are added, then the magic effects of the skills probably can go in the same job.