refact(skymp5-server): introduce GetActorToSendTo to make packets routing explicit

[Pospelove]

Important

Refactor message sending in skymp5-server by introducing GetActorToSendTo() in MpActor to handle offline actors and fix the "invisible chat" bug.

• Behavior:
  • Introduced GetActorToSendTo() in MpActor to determine the correct actor for message sending, considering hosters.
  • Applied GetActorToSendTo().SendToUser() in ActionListener.cpp, MpActor.cpp, and MpObjectReference.cpp to fix the "invisible chat" bug.
• FormCallbacks:
  • Added GetUserIdFn to FormCallbacks to retrieve user ID from MpActor.
• Refactoring:
  • Replaced direct SendToUser() calls with GetActorToSendTo().SendToUser() in multiple functions across MpActor.cpp and MpObjectReference.cpp.
• Misc:
  • Updated CreateFormCallbacks() in PartOne.cpp to include getUserId function.

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[ellipsis-dev]

Important

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1. PartOne.cpp:190

• Draft comment:
  In SetUserActor the hoster mapping for an actor is cleared (using worldState.hosters.erase). Make sure this removal is safe against concurrent updates and that it doesn’t inadvertently remove valid hoster state.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

2. PartOne.cpp:703

• Draft comment:
  The lambda for getUserId in CreateFormCallbacks returns st->UserByActor(actor). Ensure callbacks and actor pointers are always valid to prevent runtime exceptions.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

3. PartOne.cpp:544

• Draft comment:
  In SetPrivateKey and SignedJS the OpenSSLSigner is attached and a signature is appended to JS code. Verify that the private key is securely handled and that the client properly parses the appended signature comment.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

4. PartOne.cpp:904

• Draft comment:
  In TickDeferredMessages and packet history playback, the packet history buffer is accessed using saved offsets and lengths. Ensure that the buffer bounds are validated to avoid potential out‐of‐bounds access.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

5. MpObjectReference.cpp:1840

• Draft comment:
  In SendInventoryUpdate the BitStream’s raw data is reinterpreted for sending. Consider adding extra validation on the stream data pointer and size to ensure that the data is valid when sending.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

6. MpObjectReference.cpp:59

• Draft comment:
  In PreparePropertyMessage_ the code accesses base.rec to retrieve the record type. Add a safeguard in case LookupById returns a null record so that baseRecordType is handled gracefully.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

7. MpObjectReference.cpp:1822

• Draft comment:
  In MoveOnGrid, objects recalc grid positions on every position update. Consider caching grid cell calculations if many objects update frequently to avoid performance bottlenecks.
• Reason this comment was not posted:
  Confidence changes required: 50% <= threshold 50% None

8. MpObjectReference.cpp:1182

• Draft comment:
  In ApplyChangeForm a call to std::terminate is used if setProperty has been called already. Verify that killing the process in this scenario is intended, or consider a less drastic error handling strategy.
• Reason this comment was not posted:
  Comment was not on a location in the diff, so it can't be submitted as a review comment.

Workflow ID: wflow_2xlqVyMMf7QcaYGZ

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