Feature/mutileg calendar - #1251
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多腿策略枚举补充 CalendarCallSpread(7) / CalendarPutSpread(8)， 译名对齐 tubelet locales。en/zh-CN/zh-HK 三语言同步。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Follows [longbridge/developers#1251](longbridge/developers#1251), which documents two new values on the multi-leg strategy enum. `MultiLegStrategy` gains: - `CalendarCallSpread` — wire value `7` - `CalendarPutSpread` — wire value `8` Calendar (horizontal) spreads. Accepted by `TradeContext.submit_multileg`, and reported back on the `multi_leg` field of `today_orders` / `history_orders` / `order_detail` and the order-changed push. Both variants are appended after `Strangle`, so the discriminants of the existing variants are unchanged — this is additive, not a breaking change. Without them the SDK parsed the two new server values as `Unknown` and had no way to submit either strategy. ## Layers touched | Layer | Files | | --- | --- | | Rust core | `rust/src/trade/types.rs` (with the `#[strum(to_string = …, serialize = "7"/"8")]` mapping) | | C | `c/src/trade_context/enum_types.rs` | | C++ | `cpp/include/types.hpp`, `cpp/src/convert.hpp` (both `convert()` directions) | | Java | `java/src/types/enum_types.rs`, `java/javasrc/…/trade/MultiLegStrategy.java` | | Node.js | `nodejs/src/trade/types.rs` | | Python | `python/src/trade/types.rs`, `python/pysrc/longbridge/openapi.pyi` | | Generated | `c/csrc/include/longbridge.h`, `nodejs/index.d.ts` | ## Verification - `cargo clippy --all --all-features` and `cargo +nightly fmt --all` — clean (only the pre-existing `longbridge-nodejs` warnings) - `cargo build -p longbridge-c` / `-p longbridge-java` / `-p longbridge-python` — pass - `npm run build:debug` — pass; `index.d.ts` regenerated - C++: syntax-checked a TU including `convert.hpp` (`g++ -std=c++17 -fsyntax-only`); both `convert()` overloads resolve the new variants. Full CMake build not run. - strum round-trip checked with a throwaway `cargo test`: `"7"`/`"8"` and `"CalendarCallSpread"`/`"CalendarPutSpread"` parse to the new variants, and `to_string()` yields the string names. The temporary test file is not part of this PR. `java/javasrc` was not compiled — no JDK on this machine. The change there is two enum constants; the Rust JNI half does build. 🤖 Generated with [Claude Code](https://claude.com/claude-code)
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