agent threads: items sort order, page tokens like the other lists, items.pos

[theomonnom]

• AgentThread.SortOrder (UNSPECIFIED / ASC / DESC), the same values as the public API's SortOrder; livekit.agent cannot import livekit_models.proto (package livekit imports livekit/agent), so it lives here

• GetItemsRequest.sort_order: unset or ASC is oldest first; DESC starts from the latest item and pages back through older ones

• Thread List, GetItems and GetTasks page with page_token / limit / next_page_token (strings, as AgentDB.ListRequest), replacing before / after; unreleased since agent threads: thread messages and grant, agent-db service to gRPC #1841

• thread_schema_v1.sql: items.pos and tasks.pos as INTEGER PRIMARY KEY AUTOINCREMENT (insertion order, never reused, the page tokens' sort key) and items_lane_pos (lane, pos); id and task_id stay the upsert keys as TEXT NOT NULL UNIQUE

[changeset-bot]

🦋 Changeset detected

Latest commit: 0126180

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
github.com/livekit/protocol	Patch
@livekit/protocol	Patch

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