Rebranding zu NextJobs (nextjobs.cc)

- Markenname 'Bewerbungs-Tracker' -> 'NextJobs' im gesamten UI,
  Footer (incl. nextjobs.cc Copyright), Login, Wortmarke in der
  Top-Navi (Next + Jobs-Gradient), Favicon, Swagger/OpenAPI-Titel,
  CalDAV-PRODID, Browser-Erweiterung (manifest, content, background),
  Runner-Log und Doku.
- Funktionale Begriffe (Bewerbungsunterlagen, -datum etc.) bleiben.
- Docker-Registry (git.hackner.dev) als Infrastruktur unberuehrt.

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

extension/content.js

@@ -1,4 +1,4 @@
-// Content script: injects an "An Bewerbungs-Tracker senden" button next to the
+// Content script: injects an "An NextJobs senden" button next to the
 // Indeed job description, scrapes the job details and forwards them to the
 // tracker's import API (via the background service worker).
 
@@ -103,7 +103,7 @@
     const btn = document.createElement('button');
     btn.type = 'button';
     btn.className = 'bt-import-btn';
-    btn.innerHTML = ICON_SEND + '<span>An Bewerbungs-Tracker senden</span>';
+    btn.innerHTML = ICON_SEND + '<span>An NextJobs senden</span>';
 
     const status = document.createElement('div');
     status.className = 'bt-import-status';
@@ -147,7 +147,7 @@
       setStatus(status, '', '');
 
       chrome.runtime.sendMessage({ type: 'IMPORT_JOB', payload: payload }, (resp) => {
-        btn.innerHTML = ICON_SEND + '<span>' + (originalLabel || 'An Bewerbungs-Tracker senden') + '</span>';
+        btn.innerHTML = ICON_SEND + '<span>' + (originalLabel || 'An NextJobs senden') + '</span>';
 
         if (chrome.runtime.lastError) {
           btn.disabled = false;