fix: 对齐 OneBot schema 与合并转发消息处理行为 (#1694)

* fix: make defaulted request fields optional

* fix: align onebot schemas with runtime behavior

* fix: tighten schema and unsupported action metadata

* fix: reject empty forward reference ids

* fix: update GoCQHTTPSendForwardMsg to handle messages correctly and adjust payload schema

* fix: refactor message handling in GoCQHTTPSendForwardMsg and add test for message normalization

* fix: update compatibility actions to return appropriate responses and align schemas with runtime behavior

* fix: ensure payload properties are non-null with default values in action handlers

* fix: update StreamStatus comments for clarity and enforce nickname as required in message schema

* fix: integrate sleep function in GetOnlineClient and update tests to verify API call

* fix: add production test checklist for OneBot schema alignment and message handling

* fix: remove outdated production test checklist for OneBot schema alignment