Create customized Issue templates for "Bug Reports" and "Feature Requests"

[AlAfiz]

Description

"It doesn't work" is not a helpful bug report. We need to force users/contributors to provide the environment details and exact steps to reproduce the issue.

Acceptance Criteria

• Create a .github/ISSUE_TEMPLATE/ directory.
• Add bug_report.yml (using GitHub Issue Forms) requiring fields for: OS, Browser, Wallet Version, Steps to Reproduce, and Expected Behavior.
• Add feature_request.yml requiring fields for: Problem Description, Proposed Solution, and Alternatives Considered.

Technical Details

• Using .yml forms instead of raw .md files forces required fields, preventing half-empty issue submissions.