Prepare TunnelX for open-source release

.github/FUNDING.yml

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+custom:
+  - "https://www.paypal.com/donate/?business=gallafan%40gmail.com&currency_code=USD"

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report a reproducible TunnelX problem
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: What happened?
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: TunnelX version
+      placeholder: v1.2.21
+    validations:
+      required: true
+  - type: dropdown
+    id: mode
+    attributes:
+      label: Routing mode
+      options:
+        - Split route
+        - Full route
+        - App toggle
+        - Startup/connect/disconnect
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Include the smallest steps that trigger the issue.
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Sanitized logs
+      description: Remove credentials, UUIDs, private keys, and private endpoints.
+      render: text

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security reports
+    url: https://github.com/MaxiFan/TunnelX/security/advisories
+    about: Please use private advisories for sensitive reports when available.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an improvement for TunnelX
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What user problem should this solve?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: What should TunnelX do?
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives
+      description: Any other approaches you considered?

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+
+## Tests
+
+## Notes
+
+- [ ] No private configs, credentials, logs, or release artifacts were committed.
+- [ ] Documentation was updated if behavior or release packaging changed.

.github/workflows/build.yml

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+name: build
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+
+jobs:
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: "8.0.x"
+      - name: Restore
+        run: dotnet restore AppTunnel.sln
+      - name: Build
+        run: dotnet build AppTunnel.sln -c Release --no-restore