feat: package build

[rikled]

see Euro-Office/DocumentServer#92

[chrip]

1. AdminPanel branding — favicon, logo, and dark-logo SVGs added. All three SVG files are missing trailing newlines (\ No newline at end of file). Consider adding them for consistency.

2. HTML/JS title changes — "ONLYOFFICE" → "Euro-Office" in index.html, LoginPage.js, SetupPage.js, and Menu.js. alt text also updated. Looks correct.

3. production-linux.json — all paths consistently changed from onlyoffice to euro-office across log, runtime, storage, wopi, services, license, and FileConverter sections. Thorough.

4. Makefile — DOCUMENT_ROOT, OUTPUT, install paths all updated. One thing to note: line 147 still creates the onlyoffice user (useradd -m -d /var/www/onlyoffice -r -U onlyoffice). If the user should also be renamed to euro-office, this line needs updating. If not, consider adding a comment explaining why the user stays as onlyoffice while paths change.

[rikled]

4. **Makefile** — DOCUMENT_ROOT, OUTPUT, install paths all updated. One thing to note: line 147 still creates the `onlyoffice` user (`useradd -m -d /var/www/onlyoffice -r -U onlyoffice`). If the user should also be renamed to `euro-office`, this line needs updating. If not, consider adding a comment explaining why the user stays as `onlyoffice` while paths change.

Makefile is unused, so this is fine atm.