Taker + batch trade endpoints (depends on D, #50, #51)

[alastairong1]

Summary

• GET /v1/trades/taker/{address} — returns paginated market orders (taker transactions) for a given address, using DirectTradesFetcher for tx hash discovery
• POST /v1/trades/batch — accepts up to 50 order hashes, returns trades grouped by hash with cache-first lookup and DirectTradesFetcher batch fallback
• New types: TradesBatchRequest, TradesBatchResponse, TradesBatchEntry, TakerTradesResponse

Dependencies

• Blocked on PR D (DirectTradesFetcher module)
• Blocked on PRs Implement GET /v1/trades/tx/{tx_hash} endpoint #50 and Implement GET /v1/trades/{address} endpoint #51 (trades module restructure + TradesDataSource trait)
• Route registration in mod.rs and main.rs will be done during rebase once deps merge

Test plan

• Taker trades endpoint returns paginated results for known taker address
• Batch endpoint returns trades grouped by order hash
• Batch endpoint rejects >50 hashes with 400
• Cache prevents repeated SQLite queries for same order hashes

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