Add structured issue templates with YAML format

.github/ISSUE_TEMPLATE.md

@@ -1,13 +0,0 @@
-**Do you want to request a *feature* or report a *bug*?**
-
-**What is the current behavior?**
-
-**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.**
-
-**What is the expected behavior?**
-
-**Did this work in previous versions of DocumentServer?**
-
-**DocumentServer Docker tag:**
-
-**Host Operating System:**

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "Bug report"
+description: "Use this template if you're running into issues with DocumentServer Docker container."
+body:
+  - type: checkboxes
+    id: unique
+    attributes:
+      label: "This issue is unique."
+      options:
+      - label: "I have used the [search tool](https://github.com/ONLYOFFICE/Docker-DocumentServer/issues?q=) and did not find an issue describing my bug."
+        required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      description: "Select the operating system where Docker is running."
+      multiple: true
+      options:
+      - Windows
+      - macOS
+      - Linux
+    validations:
+      required: true
+  - type: dropdown
+    id: architecture
+    attributes:
+      label: Architecture
+      description: "Select the architecture of the system."
+      options:
+      - x86_64
+      - arm64
+    validations:
+      required: true
+  - type: input
+    id: docker-version
+    attributes:
+      label: "Docker version"
+      description: "Provide your Docker version (run `docker --version`)."
+      placeholder: "Example: Docker version 24.0.5"
+    validations:
+      required: true
+  - type: input
+    id: docs-version
+    attributes:
+      label: "ONLYOFFICE-Docs version"
+      description: "Please provide the exact version or Docker tag you are using."
+      placeholder: "Example: 8.0.1 or latest"
+    validations:
+      required: true
+  - type: textarea
+    id: repro-steps
+    attributes:
+      label: "Reproduction Steps"
+      description: "Provide information on how to reproduce this bug. Make sure your instructions are clear."
+      placeholder: |
+        Example:
+        1. Pull the latest DocumentServer image
+        2. Start container with docker-compose
+        3. Access http://localhost
+        4. Observe the issue
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: "Expected Behavior"
+      description: "What did you expect to happen?"
+      placeholder: "Example: The container should start successfully and be accessible on port 80."
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: "Actual Behavior"
+      description: "What did actually happen?"
+      placeholder: "Example: The container starts but DocumentServer returns 502 Bad Gateway error."
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: "Additional information"
+      description: "If you have any screenshots, error messages, logs, or other information that you feel is necessary to explain the issue, feel free to attach them here."
+      placeholder: "Example: Container logs, error messages, configuration details, etc."

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: DocumentServer Docker Documentation
+    url: https://helpcenter.onlyoffice.com/docs/installation/developer/docker
+    about: Check the Docker documentation for configuration and deployment guides.
+  - name: Community Forum
+    url: https://community.onlyoffice.com/
+    about: Ask questions and get help from the ONLYOFFICE community.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: "Feature request"
+description: "Use this form to suggest a feature."
+body:
+  - type: checkboxes
+    attributes:
+      label: "This issue is unique."
+      options:
+      - label: "I have used the [search tool](https://github.com/ONLYOFFICE/Docker-DocumentServer/issues?q=) and did not find an issue describing my idea."
+        required: true
+  - type: textarea
+    attributes:
+      label: Your idea.
+    validations:
+      required: true