V1.5.0: Version bump + Download-Button Redesign

- Version auf 1.5.0 in allen Packages, CI, Dockerfile, Electron
- Download-Button im gleichen Design wie Version-Badge (bg-secondary, radius, hover accent)
- CI Registry auf adriahub (192.168.1.100:9080) umgestellt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

electron/main.js

@@ -35,7 +35,7 @@ function createWindow() {
 
   // Custom User-Agent to identify Electron app
   const currentUA = mainWindow.webContents.getUserAgent();
-  mainWindow.webContents.setUserAgent(currentUA + ' GamingHubDesktop/1.0.0');
+  mainWindow.webContents.setUserAgent(currentUA + ' GamingHubDesktop/1.5.0');
 
   mainWindow.loadURL(HUB_URL);
 

electron/package.json

@@ -1,7 +1,7 @@
 {
   "name": "gaming-hub-desktop",
   "productName": "Gaming Hub",
-  "version": "1.0.0",
+  "version": "1.5.0",
   "description": "Gaming Hub Desktop App mit Ad-Blocker",
   "main": "main.js",
   "scripts": {

electron/preload.js

@@ -2,5 +2,5 @@ const { contextBridge } = require('electron');
 
 contextBridge.exposeInMainWorld('electronAPI', {
   isElectron: true,
-  version: '1.0.0',
+  version: '1.5.0',
 });