Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/feature.yml

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+name: Feature Request
+about: Suggest a new feature or improvement
+title: "[Feature] "
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Have an idea? We'd love to hear it!
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem / Motivation
+      description: What problem does this feature solve?
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the feature or change you'd like.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Any alternative solutions or workarounds you've considered?
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional Context
+      description: Screenshots, mockups, links, or anything else.