Add issue and PR templates for contributors

Author: cantetfelix

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report to help us improve
+title: "[Bug]: "
+labels: ["bug", "needs-triage"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to Reproduce
+      description: Steps to reproduce the behavior
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+    validations:
+      required: true
+
+  - type: input
+    id: unity-version
+    attributes:
+      label: Unity Version
+      placeholder: "e.g., 2022.3.10f1"
+    validations:
+      required: true
+
+  - type: input
+    id: package-version
+    attributes:
+      label: WebView Toolkit Version
+      placeholder: "e.g., 1.1.1"
+    validations:
+      required: true
+
+  - type: dropdown
+    id: graphics-api
+    attributes:
+      label: Graphics API
+      options:
+        - DirectX 11
+        - DirectX 12
+    validations:
+      required: true
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Console Logs
+      render: shell

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+title: "[Feature]: "
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem Statement
+      description: Is your feature request related to a problem?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+    validations:
+      required: true
+
+  - type: textarea
+    id: use-case
+    attributes:
+      label: Use Case
+    validations:
+      required: true

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Describe your changes -->
+
+## Type of Change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+
+## Testing Performed
+- [ ] Built native plugin successfully
+- [ ] Tested in Unity Editor
+- [ ] Tested in standalone build
+- [ ] No new console warnings/errors
+
+## Checklist
+- [ ] Updated CHANGELOG.md
+- [ ] Updated package.json version if needed
+- [ ] Code follows project style
+- [ ] Added/updated tests
+- [ ] All tests pass locally