Add GitHub templates and CI workflow

- PR template
- Issue templates (bug report, feature request)
- Hassfest validation workflow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,46 @@
+---
+name: Bug Report
+about: Report a bug or unexpected behavior
+title: ''
+labels: bug
+assignees: ''
+---
+
+## Describe the Bug
+
+A clear description of what the bug is.
+
+## Environment
+
+- **Home Assistant version:**
+- **Integration version:**
+- **Emby Server version:**
+
+## Steps to Reproduce
+
+1.
+2.
+3.
+
+## Expected Behavior
+
+What you expected to happen.
+
+## Actual Behavior
+
+What actually happened.
+
+## Logs
+
+<details>
+<summary>Relevant log entries</summary>
+
+```
+Paste logs here
+```
+
+</details>
+
+## Additional Context
+
+Any other context about the problem.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Home Assistant Community
+    url: https://community.home-assistant.io/
+    about: Ask questions about Home Assistant
+  - name: Emby Documentation
+    url: https://emby.media/support
+    about: Emby official documentation and support

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,27 @@
+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## Feature Description
+
+A clear description of what you would like to see added.
+
+## Use Case
+
+Describe the problem this feature would solve or the use case it enables.
+
+## Proposed Solution
+
+If you have ideas on how to implement this, describe them here.
+
+## Alternatives Considered
+
+Any alternative solutions or features you've considered.
+
+## Additional Context
+
+Any other context, screenshots, or examples.