Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/question.yml

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+name: Question / Support
+about: Ask a question or get help
+title: "[Question] "
+labels:
+  - question
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Need help? Ask away! For security issues, please see SECURITY.md instead.
+
+  - type: textarea
+    id: question
+    attributes:
+      label: Your Question
+      description: What do you need help with?
+    validations:
+      required: true
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Context
+      description: What have you tried? What documentation have you read?
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment (if relevant)
+      description: OS, version, setup details.