chore: add community files and PSGallery publish workflow

- Add CONTRIBUTING.md, SECURITY.md, CODE_OF_CONDUCT.md
- Add .gitattributes for line ending normalization
- Add GitHub issue templates (bug report, feature request)
- Add pull request template
- Add publish.yml workflow for PSGallery publication on tag push

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,74 @@
+name: Bug Report
+description: Report a bug in PSProxmoxVE
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill out the sections below.
+
+  - type: input
+    id: module-version
+    attributes:
+      label: Module Version
+      description: Output of `(Get-Module PSProxmoxVE).Version`
+      placeholder: "0.1.0"
+    validations:
+      required: true
+
+  - type: input
+    id: pve-version
+    attributes:
+      label: Proxmox VE Version
+      description: PVE server version (e.g. 9.1-1, 8.4-1)
+      placeholder: "9.1-1"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: ps-version
+    attributes:
+      label: PowerShell Version
+      options:
+        - "5.1 (Windows PowerShell)"
+        - "7.2"
+        - "7.4"
+        - "7.5"
+        - "Other"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      options:
+        - Windows
+        - Linux
+        - macOS
+    validations:
+      required: true
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What happened? What did you expect?
+    validations:
+      required: true
+
+  - type: textarea
+    id: repro
+    attributes:
+      label: Steps to Reproduce
+      description: Minimal PowerShell commands to reproduce the issue
+      render: powershell
+    validations:
+      required: true
+
+  - type: textarea
+    id: error
+    attributes:
+      label: Error Output
+      description: Paste any error messages or verbose output
+      render: text

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for suggesting an improvement! Please describe what you'd like.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: What feature or improvement would you like?
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+      description: How would you use this feature? What problem does it solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: api-endpoints
+    attributes:
+      label: PVE API Endpoints
+      description: If this involves specific PVE API endpoints, list them here
+      placeholder: "GET /nodes/{node}/qemu/{vmid}/firewall/rules"
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any workarounds or alternative approaches?