chore: import upstream snapshot with attribution

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Something isn't working as expected.
+title: "[Bug]: "
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for reporting a bug. Please fill in the details so we can reproduce it.
+  - type: checkboxes
+    id: preflight
+    attributes:
+      label: Before reporting
+      options:
+        - label: I'm on the latest release and the issue still happens.
+          required: true
+        - label: I searched existing issues and didn't find a duplicate.
+          required: true
+  - type: textarea
+    id: what
+    attributes:
+      label: What happened?
+      description: A clear description of the bug and what you expected instead.
+      placeholder: When I ..., StemDeck ... but I expected ...
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      placeholder: |
+        1. Open StemDeck
+        2. Import ...
+        3. Click ...
+        4. See error
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating system
+      options:
+        - macOS (Apple Silicon)
+        - macOS (Intel)
+        - Windows
+        - Linux
+        - Other
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: StemDeck version
+      description: Shown in the About dialog (Help icon).
+      placeholder: e.g. v0.7.0-alpha.12
+    validations:
+      required: true
+  - type: dropdown
+    id: install
+    attributes:
+      label: How did you install it?
+      options:
+        - macOS DMG
+        - Windows ZIP
+        - From source
+        - Docker / self-hosted
+    validations:
+      required: true
+  - type: textarea
+    id: extra
+    attributes:
+      label: Logs / screenshots
+      description: Drag in screenshots or a recording, and paste any error text as code.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions & Discussion
+    url: https://github.com/stemdeckapp/stemdeck/discussions
+    about: Ask questions, share setups, or discuss ideas with the community.
+  - name: Discord
+    url: https://discord.gg/2MVsWqaPRe
+    about: Chat with the StemDeck community in real time.
+  - name: Report a security vulnerability
+    url: https://github.com/stemdeckapp/stemdeck/security/advisories/new
+    about: Please report security issues privately, not as a public issue.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea or improvement.
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for the suggestion! Tell us what you'd like and why.
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this solve?
+      description: What are you trying to do that's hard or impossible today?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered