Move default install location to /opt/stegasoo

- setup.sh: Install to /opt/stegasoo with proper permissions
- first-boot-wizard.sh: Use /opt/stegasoo
- stegasoo-wizard.sh: Check /opt first, fallback to home dirs
- sanitize-for-image.sh: Handle both /opt and home locations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/stegasoo-wizard.sh

@@ -2,9 +2,15 @@
 # Stegasoo First Boot Wizard Trigger
 # This file goes in /etc/profile.d/ and runs the wizard on first login
 
-if [ -f /etc/stegasoo-first-boot ] && [ -f /home/*/stegasoo/rpi/first-boot-wizard.sh ]; then
-    # Find the wizard script
-    WIZARD=$(ls /home/*/stegasoo/rpi/first-boot-wizard.sh 2>/dev/null | head -1)
+if [ -f /etc/stegasoo-first-boot ]; then
+    # Find the wizard script (check /opt first, then home dirs)
+    WIZARD=""
+    if [ -f /opt/stegasoo/rpi/first-boot-wizard.sh ]; then
+        WIZARD="/opt/stegasoo/rpi/first-boot-wizard.sh"
+    else
+        WIZARD=$(ls /home/*/stegasoo/rpi/first-boot-wizard.sh 2>/dev/null | head -1)
+    fi
+
     if [ -n "$WIZARD" ]; then
         bash "$WIZARD"
     fi