Add Gitea Actions workflows, CI config, and docs

.gitea/ISSUE_TEMPLATE/proposal.md

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+<!-- Title: Proposal / Design RFC -->
+# Proposal: [Short title]
+
+## Summary
+Concise description of the proposal and what outcome you want.
+
+## Problem statement
+What problem are we solving and why is it important? Include links to related issues.
+
+## Goals
+- Primary goals (what success looks like)
+- Non-goals (explicitly out of scope)
+
+## Proposed design
+Describe the design in detail. Include:
+- Architecture diagrams or ASCII art
+- API changes (requests/responses)
+- Data model changes or migrations
+- UX flows or wireframes
+
+## Alternatives considered
+Short list of alternatives and tradeoffs.
+
+## Backwards compatibility & migration plan
+Describe how to migrate existing data and any compatibility impacts.
+
+## Security considerations
+List potential security/privacy implications.
+
+## Testing & rollout plan
+How will this be tested? Phased rollout plan if needed.
+
+## Implementation plan & timeline
+High-level tasks and owners.
+
+## Open questions
+List any unresolved questions.
+
+**Checklist**
+- [ ] Linked related issues
+- [ ] Prototype or PoC (if available)