Add full contribution infrastructure: CLA with broad sublicensing
rights for dual-licensing, CONTRIBUTING.md with scope rules and dev
setup, CLA Assistant workflow, CODEOWNERS, SUPPORT.md, PR template,
updated issue templates with contribution prompts, and declarative
label config.
- Remove all lite/full variant logic from frontend, API, shared constants,
docs, and tests (single unified Docker image only)
- Replace single QEMU multi-arch Docker build with per-architecture native
builds (amd64 + arm64) and manifest merge to fix disk space exhaustion
- Add disk cleanup step and per-platform build cache scopes
- Switch release trigger from push to workflow_dispatch
- Add GitHub issue templates and PR template
SnapOtter