Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/ux.yml

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+name: User Experience (UX)
+about: Report a UX problem or suggest a UX improvement
+title: "[UX] "
+labels:
+  - ux
+body:
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: One-line summary of the UX issue or suggestion.
+    validations:
+      required: true
+
+  - type: textarea
+    id: problem
+    attributes:
+      label: Describe the Problem
+      description: Where in the product does this occur? Who is affected?
+    validations:
+      required: true
+
+  - type: textarea
+    id: impact
+    attributes:
+      label: User Impact
+      description: Explain the user pain, frequency, and severity.
+
+  - type: textarea
+    id: current
+    attributes:
+      label: Current Behavior
+      description: What a user sees now (include screenshots or steps).
+
+  - type: textarea
+    id: proposed
+    attributes:
+      label: Proposed Change
+      description: Detailed description of the UX change or recommendation.
+    validations:
+      required: true
+
+  - type: textarea
+    id: mockups
+    attributes:
+      label: Mockups / Prototypes
+      description: Attach or link to designs.
+
+  - type: textarea
+    id: accessibility
+    attributes:
+      label: Accessibility Considerations
+      description: Color contrast, keyboard navigation, screen reader notes.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Acceptance Criteria
+      options:
+        - label: Usability tested with users
+        - label: Accessibility checks passed