docs: sync hosted-pmxt custom endpoints

[realfishsam]

Auto-generated from hosted-pmxt. Updates OpenAPI paths, docs.json navigation, rate limit tables, and catalog venue list.

[realfishsam]

PR Review: PASS (NOT VERIFIED)

What This Does

This re-splits the hosted API reference so cross-venue router/catalog endpoints remain in openapi-hosted.json, while hosted trading/account endpoints are referenced from openapi-hosted-trading.json. For docs consumers, the API Reference navigation now points trading and order/account pages at the trading-specific OpenAPI file.

Blast Radius

Documentation only: docs/api-reference/openapi-hosted.json, docs/docs.json, and docs/llms-full.txt. No SDK, sidecar runtime, exchange normalizer, or generated SDK client code changes.

Consumer Verification

Before (base branch):
docs/api-reference/openapi-hosted.json bundled router/catalog paths and hosted trading/account components together, including hosted trading schemas such as BuildOrderHostedRequest, SubmitOrderHostedRequest, and HostedErrorResponse.

After (PR branch):
JSON validation and path inspection on PR head 627c8001 succeeded:

openapi-hosted.json paths: /v0/matched-event-clusters, /v0/matched-market-clusters, /v0/sql
openapi-hosted-trading.json paths: /v0/trade/create-order, /v0/trade/build-order, /v0/trade/submit-order,
  /v0/orders/cancel/build, /v0/orders/open, /v0/orders/{order_id},
  /v0/user/{address}/trades, /v0/user/{address}/positions, /v0/user/{address}/balances

docs/docs.json now maps the Cross Exchange and Enterprise groups to api-reference/openapi-hosted.json, and the Trading / Orders & Positions groups to api-reference/openapi-hosted-trading.json.

Test Results

• Build: Not run; docs-only OpenAPI/navigation sync.
• Unit tests: N/A
• Server starts: N/A
• E2E smoke: PASS for local JSON parse/path/navigation inspection of the touched docs files.

Findings

No blocking findings.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: OK for the docs split inspected here.
• Financial precision: N/A
• Type safety: N/A
• Auth safety: N/A

Semver Impact

patch -- documentation/spec navigation sync only.

Risk

I did not render the Mintlify site locally, so final hosted-doc page generation remains dependent on Mintlify accepting endpoint references from the separate openapi-hosted-trading.json file. The checked JSON and navigation wiring are internally consistent.