DirectTradesFetcher module (depends on #50, #51)

[alastairong1]

Summary

• Adds DirectTradesFetcher — a shared SQLite connection that bypasses the library's per-query connection model
• batch_fetch(): single SQL query for multiple order hashes (vs N individual queries)
• fetch_taker_tx_hashes(): finds transactions where a given address was the taker
• fetch_by_tx_hash(): finds all trades in a given transaction
• Creates performance indexes on take_orders and vault_balance_changes tables
• Handles Float hex parsing/negation in Rust instead of via custom SQLite functions

Dependencies

• Blocked on PRs Implement GET /v1/trades/tx/{tx_hash} endpoint #50 and Implement GET /v1/trades/{address} endpoint #51 which establish the trades module structure and TradesDataSource trait

Test plan

• cargo check passes (with deps)
• Fetcher initializes correctly when raindex db exists
• Batch queries return trades grouped by order hash
• Performance indexes are created on first run

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Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• DirectTradesFetcher module (depends on #50, #51) #91 👈 (View in Graphite)
• Implement GET /v1/trades/{address} endpoint #51
• Implement GET /v1/trades/tx/{tx_hash} endpoint #50
• main

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