feat: enhance listMembers method with pagination and filtering options

[pikann]

Summary

PluginApiClient.listMembers() now returns one cursor-paginated page and accepts filters, instead of returning every project member as an array. This matches the host change in Paca-AI/paca#571, where the project members endpoint is paginated.

Changes

• listMembers(opts?: ListMembersOptions): Promise<MemberPage>
  • search: words that must all appear in the member's username, name or handle (server-side).
  • ids: look up specific members by membership id or account id (at most 100).
  • cursor: the previous page's next_cursor.
  • pageSize: 1-100.
• New exported types ListMembersOptions and MemberPage ({items, page_size, next_cursor, total_count}).
• ProjectMember: role_name: string is replaced by an optional roles?: {id, name}[], matching what the members endpoint returns for a member who can hold several roles.

Breaking changes

• listMembers() returns a page object, not ProjectMember[]. Callers must read .items and follow next_cursor for more.
• ProjectMember.role_name is gone; use roles.

This needs a new SDK version. Plugins pin published versions, so they must bump their dependency and adapt listMembers calls (the time-logging and example plugins are already updated on the plugin side).

Testing

tsc --noEmit passes. No tests were added; the change is type-level plus a query-string builder.