fix(array-objects): Fix schema lookup, reindexing, and disable file upload

Address PR review feedback for array-of-objects helpers:

1. Schema resolution: Use getSchemaProperty() instead of manual traversal
   - Fixes nested array-of-objects schema lookup (e.g., news.custom_feeds)
   - Now properly descends through .properties for nested objects

2. Reindexing: Replace brittle regex with targeted patterns
   - Only replace index in bracket notation [0], [1], etc. for names
   - Only replace _item_<digits> pattern for IDs (not arbitrary digits)
   - Use specific function parameter patterns for onclick handlers
   - Prevents corruption of fieldId, pluginId, or other numeric values

3. File upload: Disable widget until properly implemented
   - Hide/disable upload button with clear message
   - Show existing logos if present but disable upload functionality
   - Prevents silent failures when users attempt to upload files
   - Added TODO comments for future implementation

Also fixes exit code handling in one-shot-install.sh to properly capture
first_time_install.sh exit status before error trap fires.

scripts/install/one-shot-install.sh

@@ -343,14 +343,16 @@ main() {
     echo ""
     
     # Execute with proper error handling
+    # Temporarily disable errexit to capture exit code instead of exiting immediately
+    set +e
     # Use sudo if we're not root, otherwise run directly
     if [ "$EUID" -eq 0 ]; then
         bash ./first_time_install.sh
     else
         sudo bash ./first_time_install.sh
     fi
-    
     INSTALL_EXIT_CODE=$?
+    set -e  # Re-enable errexit
     
     if [ $INSTALL_EXIT_CODE -eq 0 ]; then
         echo ""