feat: add profiler dex-trades command

[kome12]

Summary

Adds nansen research profiler dex-trades — a new subcommand that fetches DEX trade history for a wallet address on any supported chain via the POST /api/v1/profiler/dex-trades endpoint.

Files changed:

• src/api.js — new addressDexTrades() method (follows the same pattern as addressPerpTrades, with chain-scoped address validation and date range support)
• src/cli.js — wired into the profiler handler alongside existing subcommands; added to the help commands list
• src/schema.json — documented the new endpoint with required options
• src/__tests__/api.test.js — 6 unit tests covering endpoint URL, address/chain passthrough, orderBy, date range (default and custom days), filters, and Solana address support
• src/__tests__/coverage.test.js — added to the profiler endpoint coverage array

Example usage:

nansen research profiler dex-trades --address 0x28c6c06298d514db089934071355e5743bf21d60 --chain ethereum
nansen research profiler dex-trades --address 0x28c6c06298d514db089934071355e5743bf21d60 --chain ethereum --days 7
nansen research profiler dex-trades --address 0x28c6c06298d514db089934071355e5743bf21d60 --chain ethereum --sort trade_value_usd:desc --limit 50
nansen research profiler dex-trades --address Gu29tjXrVr9v5n42sX1DNrMiF3BwbrTm379szgB9qXjc --chain solana

Test plan

• All 27 test files pass (1486 tests, 2 skipped)
• npm run lint passes clean
• New addressDexTrades tests cover: endpoint, address/chain, orderBy, date range (default + custom), filters, and Solana address

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