fix: hardcode transport.url port for MCP Registry validation

[aliasunder]

Summary

mcp-publisher publish failed validation:

packages[0].transport.url (semantic)
invalid package transport URL: template variables in URL http://localhost:{PORT}/mcp reference undefined variables.
Available variables: [MCP_AUTH_TOKEN PUBLIC_URL MEMORY_DIR TZ LOG_LEVEL LOG_DIR LOG_RETENTION_DAYS PROTECTED_PATHS ORPHAN_EXCLUDE_FOLDERS SERVICE_DOCUMENTATION_URL -p -v -v]

The MCP Registry only allows a transport.url template variable to reference env-var names or argument names — not an argument's local variables. {PORT} existed only as the -p argument's local variable, so it's "undefined" for the URL.

Fix

• transport.url: http://localhost:{PORT}/mcp → http://localhost:8000/mcp
• -p runtime arg: {PORT}:8000 (with a PORT variable) → fixed 8000:8000

The container always listens on 8000 (Dockerfile ENV PORT=8000), so the hardcoded URL is correct. Hardcoding the -p mapping too keeps the published URL consistent with the port mapping (no override footgun). Host-port customization via the registry wasn't actually supportable anyway, since the URL can't follow a templated port.

This is registry-metadata only — no image rebuild/release needed (packages[0].version stays 0.15.4).

Validation

• jq: valid; transport.url has no remaining {templates}
• prettier clean

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