Use HK symbol suffix in LongBridge execution

[Pigbibi]

Summary

• Thread LONGBRIDGE_SYMBOL_SUFFIX into the rebalance execution cycle.
• Replace .US order/quote hardcoding with suffix-aware market symbols while preserving .US defaults.
• Add a HK dry-run regression test to ensure .HK quotes/order previews and no broker submission.
• Clarify docs that the suffix applies to both market data and order symbols.

Validation

• /tmp/qsl-longbridge-ci-venv/bin/python -m pytest -q tests/test_rebalance_service.py
• /tmp/qsl-longbridge-ci-venv/bin/python -m pytest -q
• /tmp/qsl-longbridge-ci-venv/bin/python -m compileall -q application tests
• git diff --check

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: fdb8f303ac

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Preserve suffixing for class-share tickers

When a strategy emits an unsuffixed US class-share ticker such as BRK.B or BF.B, this new guard treats the class-share dot as if a market suffix is already present and sends BRK.B to quotes/order previews instead of the prior BRK.B.US. That regresses any profile/universe containing dotted tickers because LongBridge execution still needs the market suffix; this should check for the configured suffix specifically rather than any period.

Useful? React with 👍 / 👎.