refactor(common-ts): restructure utils into domain-based modules

[ChesterSim]

Summary

• Reorganize 865-line utils/index.ts god file and common-ui-utils/ into 11 domain-based modules under src/utils/ (math, strings, enum, validation, token, trading, markets, orders, positions, accounts, core)
• Add 11 subpath exports to package.json so consumers can import from @drift-labs/common/utils/math, @drift-labs/common/utils/trading, etc.
• Deduplicate chunks, getTokenAddress, getTokenAccount (had two copies each)
• Preserve backwards compatibility via deprecation facades in src/_deprecated/ — COMMON_UI_UTILS, COMMON_UTILS, TRADING_UTILS, MARKET_UTILS, ORDER_COMMON_UTILS, USER_UTILS, COMMON_MATH, EQUALITY_CHECKS all still work
• Resolve 9 circular dependencies (down to 0)
• Add typesVersions fallback for consumers using moduleResolution: "node"

New import paths

// Targeted imports (new)
import { calculateMean, bnMax } from '@drift-labs/common/utils/math';
import { abbreviateAddress } from '@drift-labs/common/utils/strings';
import { deriveMarketOrderParams } from '@drift-labs/common/utils/trading';

// Old namespace pattern still works (deprecated)
import { COMMON_UI_UTILS } from '@drift-labs/common';
COMMON_UI_UTILS.abbreviateAddress(...)

Test plan

• All 114 existing tests pass
• TypeScript compiles with 0 errors in src/
• madge --circular reports 0 circular dependencies
• ESLint + Prettier pass
• tsc build produces correct lib/ output with all subpath targets
• Deprecated namespace exports (COMMON_UI_UTILS, etc.) match original shapes
• Verify NextJS app builds against this version
• Verify React Native app builds against this version

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