feat(ts-sdk): activity as per-batch entries, one feed per account

[majesticwizardcat]

Tracks pod#170: GET /clob/activity/{account} and pod_activity now serve one account's activity as one entry list per batch, {"<batch>": [{k, …}]}, with a type filter, newest-first whole-batch paging and next passed back as to. The SDK reads that shape and keeps client.activity(account, query) as the one feed of everything that happened to an account.

Public API

• One feed per account: client.activity(account) holds the one pod_activity subscription and the one paging state; activity.view({ types, from, to }) is a filtered view over its rows (client.activity(account, query) returns one), so the activity page, the chart and any other reader share a single subscription.
• ActivityEntry rows keep activityType and timeMs (the batch) and gain the kinds the node now stores: fill (this fill, running totals, closedAs, positionAfter), modify (new and old terms), termination (status and final totals), and the stream-only modify_reject / cancel_reject. The order row is the order as /clob/orders serves it, with its current state on REST and the admission state on the stream; live entries update the held order.
• Order.fills is gone, on /clob/orders too: fills are the activity fill rows and /clob/fills. OrderEvent.fill keeps the live fill's payload.
• A transfer row carries counterparty: the receiver when amount is negative, the sender otherwise. On the wire the money kinds use short names (tok, amt, err, cp, sz, eq); the public rows keep their names.
• ActivityType is the seven filter values; ActivityQuery.from/to are inclusive batch bounds in ms, limit counts entries per REST page.
• OrderStatus/TerminalStatus gain self_trade_canceled; OrderEvent gains cancel_reject with cancelRejection, so onEvent reports a refused cancel instead of dropping it.
• PodRestClient.activity takes {types, fromUs, toUs, limit} and returns the page as batches newest first with nextUs.

Behaviour

• ActivityHistory seeds from the newest page, subscribes from solution_now, folds every batch in order into the orders it holds, and loadOlder passes next back as to. One batch map is the dedupe point for both sources; a reconnect re-seed fills the gap from the stream cursor and keeps the paging position.
• pnlHistoryStream reads money flows with activity_types=backstop,bridge_transfer,transfer again.
• Version 0.13.0: the public types changed.

Docs

doc/api-reference/rest/openapi.yaml, doc/api-reference/rest/README.md and the pod_activity parts of doc/api-reference/json-rpc/openapi.yaml describe the new shape.

Draft until pod#170 lands.

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