refactor(meeting): meeting_room execute() Value→typed Response (#349)

[foxzool]

Summary

• Wire all 17 meeting_room leaf execute() / execute_with_options() return types from SDKResult<serde_json::Value> to typed Response structs (Closes [refactor] meeting: meeting_room 子树 execute() Value→typed 接线（287 行 typed 模型已就绪） #349).
• Align response models with Feishu historic-version docs (Response body example + field tables); GuideDocumentType APIs have no structured apiSchema.
• Empty-data write APIs (update/delete/instance reply) check is_success and default when data is absent.
• Fix ErrorEventUids as object list (uid / original_time / error_msg) and complete SummaryVchat fields.

BREAKING (v0.18): callers must use typed fields instead of resp["field"]. Request bodies remain serde_json::Value.

Test plan

• cargo test -p openlark-meeting --features meeting-room --lib (meeting_room + full lib suite)
• cargo clippy -p openlark-meeting --features full --all-targets -- -D warnings
• cargo fmt
• CI green on PR

---

Note

High Risk
v0.18 breaking change across all meeting_room execute return types forces every consumer to migrate off JSON indexing; response schema alignment may surface previously masked shape mismatches at compile or runtime.

Overview
Breaking (v0.18): All 17 historic meeting_room leaf APIs (building, room, country, district, freebusy, instance, summary) now return typed SDKResult<XxxResponse> instead of SDKResult<serde_json::Value>. Callers must use struct fields (e.g. resp.buildings[0].building_id) instead of resp["field"]. Request bodies stay serde_json::Value.

meeting_room/responses.rs is expanded to match Feishu historic doc examples: shared models (BuildingInfo, RoomInfo), ID mapping shapes (buildings + custom_bulding_id typo), free_busy as HashMap<String, Vec<FreeBusySlot>>, and summary with PascalCase ErrorEventUids / EventInfos plus SummaryErrorEvent objects and fuller SummaryVchat.

Write paths without a data payload (update/delete building & room, instance reply) no longer rely on extract_response_data; they check is_success and return Default empty response types when data is missing.

Wiremock tests and unit deserializers are updated to official JSON shapes; CHANGELOG documents the breaking change.

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