v1.1.1

Licensing and documentation follow-up to 1.1.0. No functional change — no behaviour,
route, handler or permission check differs from 1.1.1's predecessor.

Added

• MIT license banner on Assets/js/vendor/pptx-viewer.umd.js. The bundle shipped in every
  previous release carrying no license, copyright, version or origin of any kind, which made
  it indistinguishable from unattributed third-party code to anyone reviewing the archive —
  a listing risk for the plugin directory. It is first-party work by the copyright holder and
  is covered by this project's own MIT license.

Changed

• NOTICE now classifies each bundle in Assets/js/vendor/ as first-party or third-party,
  and records that docx-preview stays Apache-2.0 inside this MIT work — permitted, since
  Apache-2.0 is permissive and its attribution travels with it in NOTICE.
• scripts/patch_pptx_viewer.js header rewritten: now that the bundle is known to be
  first-party, the correct fix is to fold its six patches into the bundle's own source and
  delete this script, rather than patching a build artifact after every rebuild.
• docs/kanboard-directory-submission.md unblocked and ready to submit.
• docs/CONTRIBUTABILITY_REPORT.md verdict raised to READY.