Detect AAO Merge PhysBone components and reflect in performance calculation

[Copilot]

Performance calculations ignored AAO MergePhysBone components entirely. PhysBones targeted by MergePhysBone appeared as individual selectable items in the UI, and their merged nature wasn't reflected in component counts.

Changes

• VRChatAvatar.GetPhysBoneProviders() — Discovers AAO MergePhysBone components via reflection, wraps them as AAOMergePhysBoneProvider, and excludes their target PhysBones from the regular provider list. Falls back to previous behavior when AAO is not installed (AAOMergePhysBoneReflectionInfo.Default == null).

• AvatarDynamics.CalculatePerformanceStats() (provider overload) — Uses SelectMany(pb.GetPhysBones()) instead of Select(pb.Component as VRCPhysBone) to extract all underlying PhysBones for transform/collider/collision calculations. Overrides PhysBonesCount to count providers, not underlying VRCPhysBones (each MergePhysBone = 1 post-build component).

• VRChatAvatar.EstimatePerformanceStats() (provider overload) — Calls AvatarDynamics.CalculatePerformanceStats() with providers directly instead of flattening to VRCPhysBone[] first, preserving provider-level grouping for correct component counting.

• AvatarConverterSettingsEditor — Maps serialized VRCPhysBone[] back to current providers when estimating performance and populating the selector window, so saved configs correctly resolve to MergePhysBone providers.

No double counting

Merged PhysBones are excluded from individual VRCPhysBoneProvider entries by GetPhysBoneProviders(), so SelectMany across all providers produces a disjoint set.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>アバター内のAAO Merge PhysBoneコンポーネントの検出とパフォーマンス計算への反映</issue_title>
<issue_description>### タスク概要

表題の通り

背景・目的

親Issueの通り。

技術要件

パフォーマンス計算にAAO Merge PhysBoneの存在が考慮されること。
この目的の達成のために、PhysBoneRemoverなどが提供する、残しておくPhysBoneを選択するチェックボックスのリストでは、PhysBone単位ではなくPhysBoneProvider単位で選択できる必要がある。
また、MergePhysBoneの対象となっているPhysBoneはチェックボックスのリストから除外される必要がある。パフォーマンス計算においても重複して計算しないように注意すること。

補足情報

No response

完了条件

ビルドエラーのないこと</issue_description>

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

• Fixes アバター内のAAO Merge PhysBoneコンポーネントの検出とパフォーマンス計算への反映 #145

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.