ci: tag releases for Swift Package Manager

[lemarier]

Swift Package Manager only resolves semantic-version tags, and this repository only had @origin89/ui-react@<version> tags, so the README's 0.1.0 Swift requirement could not resolve. After a successful npm publish, publish-react.yml now adds a lightweight <version> tag (for example 0.2.0) at the released commit. That commit has already passed the Swift, iOS Simulator and Android jobs. The job fails instead of moving an existing tag that points elsewhere. The Swift version follows the React package version.

The README now points Swift consumers at an exact version and React consumers at npm; it also drops the v0.1.0 GitHub release reference, since that release does not exist. The existing 0.2.0 release at eeae8ac got a one-time backfilled 0.2.0 tag, pushed separately; a clean package depending on exact: "0.2.0" resolves that revision and builds on macOS. The inaccurate Android release-asset claim is tracked in #8.

Validation: biome ci . passes; the workflow YAML parses; gh api .../git/ref/tags/0.2.0 returned 404 and exited non-zero before the backfill, so the job takes the create branch. The new job has not run in Actions yet.

Closes #7

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• .github/workflows/publish-react.yml
• README.md
• docs/releases.md

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