chore(.gitea): Added Templates for issues and PRs

.gitea/templates/ISSUE_TEMPLATE.md

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+<!-- markdownlint-disable MD041 -->
+## Goal
+
+<!-- One sentence: what should this issue achieve? -->
+
+## Description
+
+<!-- Context and background: why is this issue necessary?
+     What is the current state, and what is missing or needs to be done? -->
+
+## Steps to Reproduce
+
+<!-- Only relevant for bugs — remove this section for tasks/features.
+     1. Go to '...'
+     2. Click on '...'
+     3. See error -->
+
+## Expected Behaviour
+
+<!-- Only relevant for bugs — what should have happened? -->
+
+## Actual Behaviour
+
+<!-- Only relevant for bugs — what happened instead? -->
+
+## Tasks
+
+- [ ] ...
+- [ ] ...
+- [ ] ...
+- [ ] Update the related parts of the documentation
+
+## Acceptance Criteria
+
+- ...
+- ...
+- ...

.gitea/templates/PULL_REQUEST_TEMPLATE.md

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+<!-- markdownlint-disable MD041 -->
+## Description
+
+<!-- What does this PR change and why? -->
+
+## Related Issue
+
+<!-- Closes #... / Relates to #... -->
+
+## Type of Change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactoring (no functional changes)
+- [ ] Documentation
+- [ ] Tests
+
+## Changes
+
+- ...
+- ...
+- ...
+
+## How Has This Been Tested?
+
+<!-- Describe how you verified your changes (unit tests, manual testing, etc.) -->
+
+## Checklist
+
+- [ ] Code follows the project's style guidelines
+- [ ] Self-review of the code has been performed
+- [ ] Tests have been added/updated and pass locally
+- [ ] Documentation has been updated where necessary
+- [ ] No new warnings or errors introduced