fix: align SDK parity type gaps

[realfishsam]

Summary

• add Python fetch_trades resolution forwarding and SubscriptionOption typing
• tighten Python BuiltOrder/cluster model typings and FeedClient errors
• add TypeScript hosted-mode submitOrder guard through the client method generator
• add TypeScript Router query/category params

Fixes #654
Fixes #651
Fixes #650
Fixes #649
Fixes #501
Fixes #500
Fixes #467
Fixes #178
Fixes #176
Fixes #175

Test Plan

• python3 -m py_compile sdks/python/pmxt/models.py sdks/python/pmxt/client.py sdks/python/pmxt/feed_client.py sdks/python/pmxt/init.py
• node sdks/typescript/scripts/generate-client-methods.js && git diff --exit-code sdks/typescript/pmxt/client.ts
• git diff --check
• npm run build --workspace=pmxt-core (fails locally: process killed in this worktree)
• npx tsc --noEmit -p sdks/typescript/tsconfig.json (fails locally: generated TypeScript client missing from checkout)

[realfishsam]

PR Review: PASS (NOT VERIFIED)

What This Does

Closes SDK type parity gaps around create-order params, feed errors, subscription options, volume fields, and router query/category parameters.

Blast Radius

Python SDK client/feed/models and TypeScript client/router/generator script.

Consumer Verification

Before (base branch):
Base SDK consumers lacked several type aliases/options and hosted submitOrder did not have the explicit local-only guard added here.

After (PR branch):
PR adds those SDK type/guard changes. Core build/Jest passed (24 suites, 644 tests); root verification then failed only because Python pytest is missing.

Test Results

• Build: PASS
• Unit tests: CORE PASS (24 suites, 644 tests; root verification blocked by missing pytest)
• Server starts: PASS during root verification
• E2E smoke: NOT VERIFIED (SDK runtime/import smoke not run)

Findings

No blocking findings.

PMXT Pipeline Check

• Field propagation (3-layer): N/A
• OpenAPI sync: N/A
• Financial precision: N/A
• Type safety: OK
• Auth safety: N/A

Semver Impact

patch -- SDK type/guard parity fix.

Risk

Type-level consumer import behavior was not executed because the SDK test environment is incomplete.