Fix VS Code extension npm build workflow

[Divv1524]

Description

Fixes the VS Code extension build workflow so contributors can use the standard npm flow.

This PR:

• Adds compile and watch scripts to vscode-extension/package.json.
• Adds required local dev dependencies: typescript, @types/node, and @types/vscode.
• Adds package-lock.json for reproducible extension installs.
• Documents the standalone extension build command in vscode-extension/README.md.
• Adds a regression test to verify the extension package keeps a valid compile workflow and emits the expected ./extension.js entrypoint.

Related Issue

Fixes #319

Type of change

• Bug fix
• New feature / enhancement
• Documentation update
• Test addition
• Refactor

Checklist

• I have read CONTRIBUTING.md
• My branch is up to date with main
• I have run pytest -v and all tests pass
• I have not introduced duplicate issues or features
• My PR title follows the format: feat/fix/docs/test: short description
• I have added tests for new features (Level 2 and 3 issues)
• No hardcoded secrets or API keys in my code
• This PR is linked to a GSSoC 2026 issue

Screenshots (if frontend change)

Not applicable. This PR only updates the VS Code extension build workflow, docs, and tests.

Test evidence

npm.cmd ci --cache .npm-cache

added 4 packages, and audited 5 packages

found 0 vulnerabilities

npm.cmd run compile

> qyverixai-vscode@0.1.0 compile

> tsc -p ./

..venv\Scripts\python.exe -B -m pytest backend\tests\test_vscode_extension_package.py -q

. [100%]

1 passed in 0.07s

..venv\Scripts\python.exe -B -m pytest backend\tests -q

........................................................................ [ 81%]

................ [100%]

88 passed in 3.97s

..venv\Scripts\python.exe -B -m ruff check backend\tests\test_vscode_extension_package.py

All checks passed!

git diff --check

Passed with only Windows CRLF warnings.

[imDarshanGK]

@Divv1524
update your branch with the latest main changes

[Divv1524]

update your branch with the latest main changes

Done, I've updated my branch with the latest changes from main.

[imDarshanGK]

@Divv1524 update the branch with the latest main changes

[imDarshanGK]

@Divv1524 update the branch with the latest main changes