chore: add contribution governance docs and dotenv dependency

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible bug in OpenFrame
+title: "bug: "
+labels: [bug]
+assignees: []
+---
+
+## Bug summary
+
+What went wrong?
+
+## Steps to reproduce
+
+1.
+2.
+3.
+
+## Expected behavior
+
+What should have happened?
+
+## Actual behavior
+
+What happened instead?
+
+## Environment
+
+- OpenFrame version/branch:
+- Bun version:
+- Node version:
+- Browser (if UI issue):
+- OS:
+
+## Relevant logs/errors
+
+```text
+Paste error logs, stack traces, or API errors here.
+```
+
+## Scope and impact
+
+- [ ] Blocking
+- [ ] High
+- [ ] Medium
+- [ ] Low
+
+Who is affected and how?
+
+## Additional context
+
+Screenshots, recordings, or links.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Questions and contribution help
+    url: https://github.com/yusufipk/OpenFrame/blob/main/CONTRIBUTING.md
+    about: Use issues for actionable tasks; for questions, include context and expected outcome.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an improvement for OpenFrame
+title: "feat: "
+labels: [enhancement]
+assignees: []
+---
+
+## Problem statement
+
+What problem are you trying to solve?
+
+## Proposed solution
+
+What do you want to happen?
+
+## Alternatives considered
+
+What alternatives did you evaluate?
+
+## Scope
+
+Which areas are affected?
+
+- [ ] API
+- [ ] Auth/access
+- [ ] Database
+- [ ] UI/UX
+- [ ] Docs
+- [ ] DevEx/Operations
+
+## Acceptance criteria
+
+How will we know this is done?
+
+- [ ] Criterion 1
+- [ ] Criterion 2
+
+## Non-goals (optional)
+
+What is explicitly out of scope?
+
+## Additional context
+
+Mockups, examples, or references.