docs: add GitHub issue templates with diagnostics export instructions

- add bug report template with instructions for attaching diagnostics
- add feature request template
- mention the 'Export for GitHub' option which provides sanitized diagnostics
- helps users provide better information when reporting issues

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: 'bug'
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Diagnostics Output**
+Please attach the diagnostics output from Pulse:
+1. Go to Settings tab
+2. Scroll to the bottom
+3. Click "Download Diagnostics" 
+4. Choose "Export for GitHub" (this creates a sanitized version without sensitive data)
+5. Copy and paste the output here or attach as a file
+
+**Environment (please complete the following information):**
+ - Pulse Version: [e.g. v4.15.0]
+ - Installation Type: [e.g. ProxmoxVE LXC, Docker, Manual]
+ - Browser: [e.g. chrome, safari]
+ - Proxmox Version: [e.g. 8.2]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Community Support
+    url: https://github.com/rcourtman/Pulse/discussions
+    about: Please ask and answer questions here
+  - name: Documentation
+    url: https://github.com/rcourtman/Pulse/wiki
+    about: Check the wiki for guides and documentation

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.
+
+**Current Setup (optional)**
+If relevant, you can attach diagnostics to show your current setup:
+1. Go to Settings tab
+2. Scroll to the bottom  
+3. Click "Download Diagnostics"
+4. Choose "Export for GitHub" (sanitized version)
+5. Attach if it helps explain your feature request