* feat: publish pixapi-mcp to the official MCP Registry
- add server.json (schema 2025-12-11) declaring the remote endpoint and the
npm stdio bridge under io.github.Pixapi-AI/pixapi-mcp
- add mcpName to package.json for registry ownership verification
- extend publish.yml: sync version from the pushed tag, validate and publish
with mcp-publisher over GitHub OIDC
- bump version to 0.1.3
* fix: shorten server.json description to fit the 100 char limit
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Co-authored-by: HackLemon <liualvin555@gmail.com>