feat: add standard OSS collaboration files and GitHub templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: Report a bug or unexpected behavior
+title: "[Bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to report this bug! Please fill out the information below to help us resolve the issue.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+      placeholder: What happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. Scroll down to '...'
+        4. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+      placeholder: Describe what you expected to happen
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+      placeholder: Describe what actually happened
+    validations:
+      required: true
+
+  - type: dropdown
+    id: version
+    attributes:
+      label: Version
+      description: Which version of OpenTimeTracker are you using?
+      options:
+        - Latest release
+        - Develop branch
+        - Specific version (specify in additional context)
+    validations:
+      required: true
+
+  - type: dropdown
+    id: platform
+    attributes:
+      label: Platform
+      description: What operating system are you using?
+      options:
+        - Windows
+        - macOS (Intel)
+        - macOS (Apple Silicon)
+        - Linux
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant Logs
+      description: Please paste any relevant log output or error messages
+      placeholder: |
+        Paste logs here (if applicable)
+      render: shell
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+      description: If applicable, add screenshots to help explain your problem
+      placeholder: Drag and drop images here
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any other context about the problem here (e.g., specific version, commit hash, configuration)
+      placeholder: Any additional information that might be helpful

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: ✨ Feature Request
+description: Suggest a new feature or enhancement
+title: "[Feature]: "
+labels: ["enhancement", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting a new feature! Please provide as much detail as possible.
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: Is your feature request related to a problem? Please describe.
+      placeholder: I'm frustrated when...
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like
+      placeholder: I would like to see...
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Describe any alternative solutions or features you've considered
+      placeholder: Alternative approaches could be...
+
+  - type: dropdown
+    id: area
+    attributes:
+      label: Feature Area
+      description: Which area of the application does this feature relate to?
+      options:
+        - Projects
+        - Tasks
+        - Time Entries
+        - Calendar
+        - Tags
+        - UI/UX
+        - Settings
+        - Database/Backup
+        - Performance
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: priority
+    attributes:
+      label: Priority
+      description: How important is this feature to you?
+      options:
+        - Low - Nice to have
+        - Medium - Would improve workflow
+        - High - Critical for my use case
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: contribution
+    attributes:
+      label: Contribution
+      description: Are you willing to contribute to implementing this feature?
+      options:
+        - label: I would like to implement this feature
+        - label: I can help test this feature
+        - label: I can help with documentation
+
+  - type: textarea
+    id: mockups
+    attributes:
+      label: Mockups or Examples
+      description: If applicable, add mockups, sketches, or examples from other applications
+      placeholder: Drag and drop images here or describe examples
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Add any other context, screenshots, or examples about the feature request
+      placeholder: Any additional information that might be helpful

.github/pull_request_template.md

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+## Description
+
+<!-- Provide a clear and concise description of your changes -->
+
+### Goal
+
+<!-- What problem does this PR solve? -->
+
+### Key Changes
+
+<!-- Summarize the main changes in this PR -->
+
+- 
+- 
+- 
+
+## Type of Change
+
+<!-- Mark the relevant option(s) with an 'x' -->
+
+- [ ] 🐛 Bug fix (non-breaking change which fixes an issue)
+- [ ] ✨ New feature (non-breaking change which adds functionality)
+- [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] 📝 Documentation update
+- [ ] 🎨 Style/UI changes
+- [ ] ♻️ Refactoring (no functional changes)
+- [ ] ⚡ Performance improvement
+- [ ] ✅ Test updates
+- [ ] 🔧 Build/configuration changes
+
+## Impact Assessment
+
+### Database Impact
+
+<!-- Does this PR include database schema changes or migrations? -->
+
+- [ ] No database changes
+- [ ] New migration(s) included
+- [ ] Existing data migration required
+
+<!-- If yes, describe the impact -->
+
+### Backup Impact
+
+<!-- Does this affect backup/restore functionality? -->
+
+- [ ] No impact on backups
+- [ ] Backup format changed
+- [ ] Restore compatibility maintained
+
+<!-- If yes, describe the impact -->
+
+## Testing
+
+### How Has This Been Tested?
+
+<!-- Describe the tests you ran and steps to reproduce -->
+
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] Manual testing
+- [ ] Tested with SonarQube analysis
+
+### Test Steps
+
+<!-- Provide step-by-step instructions for reviewers to test your changes -->
+
+1. 
+2. 
+3. 
+
+### Test Configuration
+
+- **Node version**: 
+- **npm version**: 
+- **Platform tested**: <!-- Windows / macOS / Linux -->
+
+## UI Changes
+
+<!-- If this PR includes UI changes, please provide screenshots or videos -->
+
+### Before
+
+<!-- Screenshot or description of UI before changes -->
+
+### After
+
+<!-- Screenshot or description of UI after changes -->
+
+## Checklist
+
+<!-- Mark completed items with an 'x' -->
+
+- [ ] My code follows the project's coding standards
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings or errors
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] I have run `npm run lint` and fixed any issues
+- [ ] I have run `npm test` and all tests pass
+- [ ] I have run `npm run test:electron` and all tests pass
+- [ ] I have run `npm run sonar:check` and the analysis passes
+- [ ] Any dependent changes have been merged and published
+
+## Breaking Changes
+
+<!-- If this PR contains breaking changes, describe them here -->
+
+- [ ] This PR contains breaking changes
+
+<!-- Describe what breaks and how users should adapt -->
+
+## Related Issues
+
+<!-- Link to related issues using #issue_number -->
+
+Closes #
+Related to #
+
+## Additional Context
+
+<!-- Add any other context about the PR here -->
+
+## Reviewer Notes
+
+<!-- Any specific areas you'd like reviewers to focus on? -->