Actually commit api-client-php's vendor/ - it was silently gitignored

omsorgCore/CLAUDE.md documents vendor/ as committed so the app can run
without a composer install step, but the generator's own .gitignore
(api-client-php/.gitignore) excludes /vendor/ - it only ever existed
untracked on disk locally, which is why the Docker build worked for me
but mitarbeiter-app crashed at runtime on a real (fresh-checkout) deploy:
"Failed opening required '.../api-client-php/vendor/autoload.php'".
Verified by building from a git-archive-simulated fresh checkout with
this fix applied - mitarbeiter-app's login page now renders without the
fatal error.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

omsorgWeb/mitarbeiter-app/api-client-php/vendor/composer/LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) Nils Adermann, Jordi Boggiano
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.