Add GitHub issue forms

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report a problem with WP Super Cache.
+labels:
+  - bug
+  - needs-triage
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for taking the time to help us improve WP Super Cache!
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the problem
+      description: Tell us what happened and what you expected to happen instead.
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: List the steps that consistently show the problem.
+      placeholder: |
+        1. Go to ...
+        2. Click on ...
+        3. See ...
+    validations:
+      required: true
+  - type: input
+    id: wordpress-version
+    attributes:
+      label: WordPress version
+      placeholder: e.g. 6.8.2
+    validations:
+      required: true
+  - type: input
+    id: wp-super-cache-version
+    attributes:
+      label: WP Super Cache version
+      placeholder: e.g. 2.0.0
+    validations:
+      required: true
+  - type: input
+    id: php-version
+    attributes:
+      label: PHP version
+      description: If you know it, you can usually find this under Tools > Site Health > Info.
+      placeholder: e.g. 8.3
+  - type: input
+    id: hosting-provider
+    attributes:
+      label: Hosting provider
+      description: If known, tell us which company hosts your site.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Help and configuration questions
+    url: https://wordpress.org/support/plugin/wp-super-cache/
+    about: Ask for help with installing, configuring, or using WP Super Cache.
+  - name: Security reports
+    url: https://hackerone.com/automattic
+    about: Report security vulnerabilities privately through Automattic's HackerOne program.

.github/ISSUE_TEMPLATE/enhancement.yml

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+name: Enhancement
+description: Suggest an improvement to an existing feature.
+title: "Enhancement: "
+labels:
+  - enhancement
+  - needs-triage
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for helping us improve WP Super Cache!
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the improvement
+      description: Tell us what you would like to improve and how you would expect it to work.
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any examples, screenshots, or other details that might help us understand your suggestion.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest a new feature.
+title: "Feature Request: "
+labels:
+  - enhancement
+  - needs-triage
+body:
+  - type: markdown
+    attributes:
+      value: Thanks for helping us make WP Super Cache better!
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature
+      description: Tell us what you would like WP Super Cache to do and how it would help you.
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Add any examples, screenshots, or other details that might help us understand your request.