fix(typescript): replace any with proper types for Exchange router methods

[AbhilashG12]

What this PR does

Adds proper TypeScript types to Exchange router methods.

The Problem

Five Exchange methods used params?: any instead of typed params:

• fetchMarketMatches
• fetchEventMatches
• compareMarketPrices
• fetchMatchedPrices
• fetchArbitrage

The Fix

• Added typed param interfaces in router.ts
• Updated all five methods to use proper types
• Added proper return types

Why it matters

TypeScript users now get proper type checking when calling these methods.

Fixes #1403

[realfishsam]

PR Review: FAIL

What This Does

This PR is intended to tighten TypeScript SDK typings for router/matching methods. In the final head commit, however, the regenerated client.ts reverts those router methods back to any and removes hosted-mode dispatch branches for several trading/account methods, which would matter directly to hosted SDK consumers.

Blast Radius

TypeScript SDK only (sdks/typescript/pmxt/client.ts), affecting router/matching method type surfaces and hosted trading/account reads/writes (cancelOrder, fetchOrder, fetchOpenOrders, fetchMyTrades, fetchPositions, fetchBalance).

Consumer Verification

Before (base branch):
Static inspection of the base TypeScript SDK shows hosted-mode dispatch exists for these methods; for example cancelOrder calls _hostedCancelOrder(orderId) before falling back to the local sidecar route, and fetchPositions uses HOSTED_METHOD_ROUTES + _tradingRequest to call hosted /api/p2p/my-style routes.

After (PR branch):
On PR head d33d23d8, sdks/typescript/pmxt/client.ts:1168 cancelOrder, :1194 fetchOrder, :1220 fetchOpenOrders, :1246 fetchMyTrades, :1324 fetchPositions, and :1350 fetchBalance no longer check this.isHosted and instead post to ${baseUrl}/api/${exchangeName}/<method> with sidecar-style { args, credentials }. A hosted SDK consumer with PMXT_API_KEY/hosted base URL would hit the wrong endpoint shape for these methods instead of the hosted route helpers.

Test Results

• Build: NOT VERIFIED — npm run build --workspace=pmxtjs is blocked in this review checkout by missing generated SDK artifacts: pmxt/client.ts(15,8): error TS2307: Cannot find module '../generated/src/index.js' and pmxt/server-manager.ts(7,43): error TS2307.
• Unit tests: NOT RUN because the TypeScript SDK build is blocked by missing generated artifacts.
• Server starts: NOT RUN; this is an SDK-only change and build artifacts were missing.
• E2E smoke: FAIL by static consumer-path trace for hosted SDK methods: the PR removes hosted dispatch and routes hosted consumers to sidecar-style endpoints.

Findings

1. sdks/typescript/pmxt/client.ts:1168, 1194, 1220, 1246, 1324, 1350 — Blocking regression: the final regenerated client removes the hosted-mode branches for order/account methods. Those methods now always use /api/${exchangeName}/... sidecar calls with { args, credentials }, bypassing HOSTED_METHOD_ROUTES, _tradingRequest, resolveWalletAddress, and the hosted mappers. This breaks hosted TypeScript consumers for cancelOrder, fetchOrder, fetchOpenOrders, fetchMyTrades, fetchPositions, and fetchBalance.
2. sdks/typescript/pmxt/client.ts:1450, 1477, 1525, 1603, 1650 — The stated fix is not present in the final head. fetchMarketMatches, fetchEventMatches, compareMarketPrices, fetchMatchedPrices, and fetchArbitrage are still declared as params?: any / Promise<any[]> (or params: any), so the PR does not resolve the any typing issue it claims to fix.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: N/A
• Type safety: ISSUE — target router methods remain any in the final head.
• Auth safety: ISSUE — hosted authenticated trading/account methods no longer use the hosted auth/route path.

Semver Impact

patch if fixed -- intended SDK type-only bug fix, but current head contains a breaking hosted SDK regression.

Risk

I could not run the full TypeScript build because generated SDK artifacts are absent in the review checkout, but the blocking issues above are visible in the checked-in source and do not depend on build output.