Fix area skill attacks hitting summoned monsters implicitly

[Copilot]

Area skill attacks (e.g., triple shot) were automatically damaging summoned monsters from the attacking player and other players. Summoned monsters should only be hit when explicitly targeted via extraTargetId, not through area-of-effect.

Changes

• GetTargetsInRange: Added filter to exclude summoned monsters from implicit area attacks

  targetsInRange = targetsInRange.Where(target => target is not Monster { SummonedBy: not null });

• GetTargets: Modified to yield extraTarget before iterating GetTargetsInRange, ensuring explicit targets (including summoned monsters) are always included when valid

• Added using MUnique.OpenMU.GameLogic.NPC; for Monster class reference

Behavior

• Area skills no longer auto-hit summoned monsters in range
• Explicit targeting via extraTargetId still works for summoned monsters
• Regular monsters unaffected

Original prompt

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This section details on the original issue you should resolve

<issue_title>AreaSkillAttackAction: It hits the own summoned monster</issue_title>
<issue_description>Describe the bug
Area skill attacks automatically damage the own summoned monsters (by elf skill) and summoned monsters of other elfs. Summoned monsters should not be implicitly attacked, only when their ID appear as explicit extra target.

To Reproduce
Steps to reproduce the behavior:

1. Log into the game as elf, e.g. testgm account
2. Summon a new monster
3. Do some triple skill attacks

Expected behavior
Summoned monsters shouldn't be attacked.

Additional context
Affected code at https://github.com/MUnique/OpenMU/blob/master/src/GameServer/MessageHandler/AreaSkillHitHandlerPlugIn.cs
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes AreaSkillAttackAction: It hits the own summoned monster #684

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[sven-n]

Perfect!