Modernize CI workflows and README badges following typeorm-adapter pattern

[Copilot]

Aligns CI/CD pipeline and README with the typeorm-adapter reference implementation.

CI Workflows

• Downgraded GitHub Actions to v2.1.5 for consistency with reference repo
• Added Run Fix step to lint job
• Introduced semantic-release job with proper permissions (contents: write)
• Expanded Node.js test matrix: [^18, ^20]
• Added parallel: true to Coveralls for concurrent coverage reporting
• Removed redundant permissions blocks

README

Streamlined badges to essential set:

• Removed: install size, codebeat, release
• Retained: CI status, coverage, NPM version/downloads, Discord

Configuration

Added "release": "semantic-release" script to package.json for automated versioning.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[feature] re-write the whole CI scripts and README content text, add all README badges</issue_title>
<issue_description>refer to: https://github.com/node-casbin/typeorm-adapter</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [feature] re-write the whole CI scripts and README content text, add all README badges #22

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[hsluoyz]

@copilot need to add CI to run tests, add semantic release to auto release new versions to both NPM and GitHub Releases for merged PRs, re-write the whole README, add README badges

should 100% totally refer to: https://github.com/node-casbin/typeorm-adapter

[coveralls]

Pull Request Test Coverage Report for Build 21601217973

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 75.855%

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Totals
Change from base Build 21600173600:	0.0%
Covered Lines:	1370
Relevant Lines:	1715

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💛 - Coveralls

[hsluoyz]

@copilot only run against Node.js 20 in every CI script, drop the Node.js 18 for all CI scripts