Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/bug.yml

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+name: Bug Report
+about: Report a bug or unexpected behavior
+title: "[Bug] "
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting a bug! Please fill out the sections below.
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of the bug.
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to Reproduce
+      description: How can we reproduce this issue?
+      placeholder: |
+        1. Go to '...'
+        2. Click on '...'
+        3. See error
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: OS, browser, version, etc.
+      placeholder: |
+        - OS: Ubuntu 22.04
+        - Python: 3.11
+        - Version: v1.2.3
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs / Screenshots
+      description: Paste any relevant logs or screenshots.