chore: change the connection timeout period to 5 seconds

[ice909]

No description provided.

[Copilot]

Pull Request Overview

This pull request updates the connection timeout configuration by increasing the default period to 5 seconds and providing more informative error messages.

• Updates error messages in ostree_repo.cpp to suggest adjusting the timeout for slow networks.
• Refactors apiClient.c to dynamically set the connection timeout based on the LINGLONG_CONNECT_TIMEOUT environment variable, with a fallback default of 5 seconds.

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
libs/linglong/src/linglong/repo/ostree_repo.cpp	Updated error messages to guide users on modifying the connection timeout.
external/http/src/apiClient.c	Introduced dynamic timeout logic with environment variable parsing and a default value of 5 seconds.

Files not reviewed (1)

• tools/openapi-c-libcurl-client/apiClient.c.mustache: Language not supported

Comments suppressed due to low confidence (1)

external/http/src/apiClient.c:444

• [nitpick] When LINGLONG_CONNECT_TIMEOUT is set with an invalid value, the code silently defaults to 5 seconds without notifying the user. Consider logging a warning message to aid in debugging configuration issues.

timeout = strtol(timeout_str, &endptr, 10);