Issue and PR templates — bug reports, feature requests, PRs

[yashdev9274]

Description

Create GitHub issue and PR templates for the repository.

Expected Deliverables

• .github/ISSUE_TEMPLATE/bug-report.yml: version, OS, Node, provider, repro steps, expected vs actual, logs
• .github/ISSUE_TEMPLATE/feature-request.yml: problem, solution, alternatives
• .github/PULL_REQUEST_TEMPLATE.md: description, related issue, checklist (tested, linted, type-checked)
• config.yml for template chooser

Why

Consistent templates reduce back-and-forth and help contributors submit high-quality reports.