Add playerId filter to GetEntriesOptions

[tudddorrr]

No description provided.

[claude]

PR Review: Add playerId filter to GetEntriesOptions

This is a clean, minimal PR. The changes are well-scoped, the readonly fix is a good catch, and the updated [Obsolete] messages are consistent across all deprecated overloads.

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🔵 Minor — Simultaneous aliasId + playerId usage is undefined

GetEntriesOptions now exposes two independent filter fields with no documentation or validation preventing them from being set at the same time:

var options = new GetEntriesOptions
{
    aliasId = someAliasId,
    playerId = somePlayerId  // Both sent to server simultaneously
};

The resulting query string would include both aliasId=...&playerId=..., but the server behaviour in this case is unspecified from the client side. A brief XML doc comment on the class or fields clarifying their relationship (mutually exclusive vs. combinable) would help callers use this correctly.

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No other issues found.