build: remove travis ci

[tomghuang]

We've switched to GitHub Workflow, so we don't need any Travis CI settings.

[Copilot]

Pull Request Overview

This PR removes all Travis CI configuration files now that GitHub Workflows are in place.

• Deleted Travis CI scripts and config
• Cleared .travis directory content

Reviewed Changes

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

File	Description
.travis/run.sh	Removed deprecated Travis CI run script
.travis/install.sh	Removed deprecated Travis CI install script
.travis.yml	Removed Travis CI configuration file

Comments suppressed due to low confidence (3)

.travis/run.sh:1

• [nitpick] Since the script is fully removed, consider deleting run.sh and the empty .travis directory to clean up the repository.

#!/bin/bash

.travis/install.sh:1

• [nitpick] The install.sh script is now empty; you can remove this file and the .travis folder entirely for clarity.

#!/bin/bash

.travis.yml:1

• [nitpick] With all Travis config removed, delete .travis.yml to avoid empty or unused config files in the repo.

env: