GitHub: Add YML files to define form fields based on existing templates

Signed-off-by: Michael Mayer <michael@photoprism.app>

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Report a new and clearly identified bug that must be fixed directly in the application
+title: "Category: Short Description (PLEASE CHANGE)"
+labels:
+  - bug
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Before filing a bug report, verify that it is not a technical support request or question:
+        - thoroughly review our Getting Started and User Guides:
+          https://docs.photoprism.app/
+        - work through our troubleshooting checklists:
+          https://docs.photoprism.app/getting-started/troubleshooting/ 
+        - do not report known issues or missing features as bugs:
+          https://docs.photoprism.app/known-issues/
+  - type: checkboxes
+    id: prerequisites
+    attributes:
+      label: Before You Continue
+      description: Confirm that you reviewed the guidance above.
+      options:
+        - label: I confirm that this is a new bug report, not a support request, and that I followed the linked troubleshooting steps.
+          required: true
+  - type: textarea
+    id: documented-behavior
+    attributes:
+      label: What Is Not Working as Documented?
+      description: Be specific and include links to the relevant documentation when possible.
+      placeholder: Describe the incorrect behavior and link to the related documentation on https://docs.photoprism.app/.
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction-steps
+    attributes:
+      label: How Can We Reproduce It?
+      description: Provide numbered steps so we can reproduce the behavior reliably.
+      placeholder: |
+        1. Go to ...
+        2. Click ...
+        3. Scroll to ...
+        4. Expected vs. actual result
+      render: markdown
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: What Behavior Do You Expect?
+      description: Share the correct outcome you expected to see.
+    validations:
+      required: true
+  - type: textarea
+    id: possible-cause
+    attributes:
+      label: What Could Be the Cause?
+      description: Summarize any investigation you have already completed and the potential root cause.
+  - type: textarea
+    id: supporting-material
+    attributes:
+      label: Logs, Sample Files, or Screenshots
+      description: Attach or link to files that help us reproduce the problem. Import and indexing issues require sample files and logs.
+      placeholder: Provide links to archives, logs, or screenshots. See https://www.photoprism.app/contact for secure sharing options.
+  - type: textarea
+    id: software-versions
+    attributes:
+      label: Which Software Versions Do You Use?
+      description: Include all relevant software versions so we can reproduce the environment.
+      placeholder: |
+        - PhotoPrism Architecture & Build Number (AMD64, ARM64, ARMv7, ...):
+        - Database Type & Version (MariaDB, MySQL, SQLite, ...):
+        - Operating System Types & Versions (Linux, Windows, Android, ...):
+        - Browser Types & Versions (Firefox, Chrome, Safari on iPhone, ...):
+        - Ad Blockers, Browser Plugins, or Firewall Software:
+      render: markdown
+    validations:
+      required: true
+  - type: textarea
+    id: installation-device
+    attributes:
+      label: On What Device Is PhotoPrism Installed?
+      description: Provide hardware details, especially for performance, import, or indexing issues.
+      placeholder: |
+        - Device / Processor Type (Raspberry Pi 4, Intel Core i7-3770, AMD Ryzen 7 3800X, ...):
+        - Physical Memory & Swap Space (GB):
+        - Storage Type (HDD, SSD, RAID, USB, Network Storage, ...):
+        - Additional Context:
+      render: markdown
+  - type: textarea
+    id: networking-setup
+    attributes:
+      label: Do You Use a Reverse Proxy, Firewall, VPN, or CDN?
+      description: Specify type and version if applicable; include NGINX configuration when relevant.
+      placeholder: Describe proxies, VPNs, CDNs, or firewall software involved. Include versions and configuration snippets when helpful.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest a new feature or enhancement
+title: "Category: Short Description (PLEASE CHANGE)"
+labels:
+  - idea
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        PLEASE ONLY PROCEED IF YOU ARE ABSOLUTELY SURE THAT THIS IS NOT A TECHNICAL SUPPORT INCIDENT AND/OR A PROBLEM WITH OTHER SOFTWARE YOU ARE USING.
+        Review our public roadmap and search for existing feature requests before submitting a new one:
+        - https://link.photoprism.app/roadmap
+        - https://github.com/photoprism/photoprism/issues
+        Learn more about support options at https://www.photoprism.app/kb/getting-support.
+  - type: checkboxes
+    id: request-prep
+    attributes:
+      label: Confirmation
+      description: Make sure you completed these steps before opening a new request.
+      options:
+        - label: I confirm that this request is not a support question and that I searched the roadmap and existing issues.
+          required: true
+  - type: textarea
+    id: problem-statement
+    attributes:
+      label: What Problem Does This Solve and Why Is It Valuable?
+      description: Explain the underlying problem and why solving it matters to many users.
+      placeholder: Describe the problem, why it is important, and who is affected.
+    validations:
+      required: true
+  - type: textarea
+    id: proposed-solution
+    attributes:
+      label: What Solution Would You Like?
+      description: Provide a clear and concise description of the feature or enhancement you propose.
+      placeholder: Outline the proposed solution or experience from the user's perspective.
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: What Alternatives Have You Considered?
+      description: Describe other options you explored and why they are less suitable.
+      placeholder: Mention any alternative solutions, workarounds, or related features you evaluated.
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional Context
+      description: Share relevant context, references, or screenshots that illustrate the request.
+      placeholder: Add links, references, or screenshots that help explain the request.

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: General questions or assistance requests should go to Discussions or community channels
+title: "Category: Short Description (PLEASE CHANGE)"
+labels:
+  - question
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        FOR GENERAL QUESTIONS, TECHNICAL SUPPORT, AND TO GET TO KNOW OTHER COMMUNITY MEMBERS, VISIT https://github.com/photoprism/photoprism/discussions.
+        OUR TROUBLESHOOTING CHECKLISTS HELP YOU QUICKLY DIAGNOSE AND FIX COMMON PROBLEMS: https://docs.photoprism.app/getting-started/troubleshooting/.
+        PLEASE DO NOT OPEN AN ISSUE FOR YOUR QUESTION, AND USE GITHUB DISCUSSIONS OR OUR COMMUNITY CHAT INSTEAD. THANK YOU VERY MUCH!
+  - type: checkboxes
+    id: question-confirmation
+    attributes:
+      label: Please Confirm
+      options:
+        - label: I understand that general questions should be posted in Discussions or community chat, and I still need to open an issue here.
+          required: true
+  - type: textarea
+    id: question-details
+    attributes:
+      label: Question Details
+      description: Provide the specific question and the context needed to answer it.
+      placeholder: Summarize your question, the context, and any resources you have already reviewed.
+    validations:
+      required: true