publish to npm via trusted publishing

[mrhyde]

npm tokens are being restricted (account changes Aug 2026, direct publishing Jan 2027) and the existing ones are expiring. Publishing already goes through OIDC when a trusted publisher is configured, so the token env var is a dead fallback path.

Needs a trusted publisher on npmjs.com for this package before the next release: repository 2BAD/onvif, workflow publish.yml, no environment.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 2.50%. Comparing base (d8dc9c9) to head (3ce0627).

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #31   +/-   ##
======================================
  Coverage    2.50%   2.50%           
======================================
  Files           8       8           
  Lines         639     639           
  Branches      221     221           
======================================
  Hits           16      16           
  Misses        514     514           
  Partials      109     109           

Flag	Coverage Δ
unit	2.50% <ø> (ø)

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