Added support for HTTP response context cancellation, including logic for registering, triggering, and cleaning up cancellation functions.
Introduced a responseCancels mapping and corresponding synchronization lock in FrameHandler to track and control the request lifecycle.
When the data frame type is closed, actively called cancelResponse to release related resources.
Simultaneously, during the response body reading process, identified context cancellation or timeout errors and prematurely terminated the processing flow to avoid invalid operations.
Adds a `lastActivityAt` field to the `streamingResponseEntry` structure to record the last active time of the streaming response.
Updates this timestamp when creating the streaming response, sending headers, and sending data blocks.
Modifies the logic for cleaning up timeout channels, using the last activity time instead of the creation time to determine if a timeout has occurred, improving accuracy in long-connection scenarios.
