[Bounty #908] Implement /wallet/history with unified transfers + rewards

[mtarcure]

Closes #908 (fixes #775, #886)

Summary

• Enhanced /wallet/history to query both pending_ledger (transfers) and epoch_rewards (mining payouts)
• Returns unified, time-sorted response with offset/limit pagination
• Response format matches the spec: {"ok": true, "miner_id": "...", "transactions": [...], "total": N}

What changed

The existing endpoint only returned transfers. Now it also includes mining rewards with type: "reward" and epoch metadata. All transactions are merged and sorted by timestamp descending.

Transaction types

type	source	description
transfer_out	pending_ledger	Sent transfer
transfer_in	pending_ledger	Received transfer
reward	epoch_rewards	Mining epoch payout

Example response

GET /wallet/history?miner_id=dual-g4-125&limit=50

{
  "ok": true,
  "miner_id": "dual-g4-125",
  "transactions": [
    {"type": "reward", "amount": 0.297, "epoch": 424, "timestamp": ..., "tx_hash": "reward_epoch_424_dual-g4-"},
    {"type": "transfer_in", "from": "founder_community", "amount": 10.0, "timestamp": ..., "tx_hash": "..."}
  ],
  "total": 42,
  "limit": 50,
  "offset": 0
}

🤖 Generated with Claude Code

[Scottcjn]

Thanks mtarcure! However, bounty #908 was already fulfilled by createkr's PR #945 (merged yesterday). Your unified history concept (transfers + rewards in one response) is a good enhancement idea — consider opening a new issue for it as a separate bounty.

Your DriftLock stress test (#127 on shaprai) was excellent work — keep contributing!