feat(installer): added feature to delete files in config

When adding files or directory in a .delete directory that file or
folder will be removed

sync-config

@@ -68,6 +68,26 @@ copy_file() {
   fi
 }
 
+delete_file() {
+  local dst="$1"
+  if $dry_run; then
+    echo "delete: $dst"
+  else
+    rm -f "$dst"
+    echo "deleted: $dst"
+  fi
+}
+
+delete_dir() {
+  local dst="$1"
+  if $dry_run; then
+    echo "delete dir: $dst"
+  else
+    rm -rf "$dst"
+    echo "deleted dir: $dst"
+  fi
+}
+
 if [[ ! -d "$src_dir" ]]; then
   echo "Error: source config directory not found: $src_dir" >&2
   exit 1
@@ -104,11 +124,55 @@ if [[ ! -e "$base_path" ]]; then
   exit 1
 fi
 
+check_delete_marker() {
+  local rel_path="$1"
+
+  # Check centralized .delete folder: config/.delete/path/to/dir_or_file
+  if [[ -f "$src_dir/.delete/$rel_path" ]] || [[ -d "$src_dir/.delete/$rel_path" ]]; then
+    return 0
+  fi
+
+  # Check inline .delete marker: config/path/to/.delete/dir_or_file
+  local parent_path="$src_dir/$rel_path"
+  local parent_dir=$(dirname "$parent_path")
+  local base_name=$(basename "$parent_path")
+  if [[ -f "$parent_dir/.delete/$base_name" ]] || [[ -d "$parent_dir/.delete/$base_name" ]]; then
+    return 0
+  fi
+
+  return 1
+}
+
+# Check if a path is a .delete directory or inside one (should be skipped during traversal)
+is_in_delete_dir() {
+  local rel_path="$1"
+  # Check if the path itself is a .delete directory or any parent is .delete
+  local current="$rel_path"
+  while [[ "$current" != "." && "$current" != "/" && -n "$current" ]]; do
+    local base
+    base=$(basename "$current")
+    if [[ "$base" == ".delete" ]]; then
+      return 0
+    fi
+    current=$(dirname "$current")
+  done
+  return 1
+}
+
 sync_file() {
   local src_path="$1"
   local rel_path=${src_path#"$src_dir"/}
   local dst_path="$dest_dir/$rel_path"
 
+  # Check if there's a corresponding .delete marker for this file
+  if check_delete_marker "$rel_path"; then
+    if [[ -f "$dst_path" ]]; then
+      delete_file "$dst_path"
+      deleted_files+=("$dst_path")
+    fi
+    return
+  fi
+
   if [[ ! -f "$dst_path" ]]; then
     copy_file "$src_path" "$dst_path"
     return
@@ -135,9 +199,55 @@ elif [[ -d "$base_path" ]]; then
       continue
     fi
 
+    # Check if this is a .delete directory - process its contents to delete in destination
+    if [[ -d "$src_path" && "$(basename "$rel_path")" == ".delete" ]]; then
+      # Get the parent directory of the .delete folder
+      parent_rel_path=$(dirname "$rel_path")
+      # Process all files in this .delete directory to delete corresponding files in destination
+      for delete_marker in "$src_path"/**; do
+        if [[ -e "$delete_marker" ]]; then
+          # Get the basename of the marker (file/dir to delete)
+          marker_basename=$(basename "$delete_marker")
+          # Construct the target path in the parent directory
+          target_rel_path="$parent_rel_path/$marker_basename"
+          target_dst_path="$dest_dir/$target_rel_path"
+
+          if [[ -d "$delete_marker" ]]; then
+            if [[ -d "$target_dst_path" ]]; then
+              delete_dir "$target_dst_path"
+            fi
+          elif [[ -f "$delete_marker" ]]; then
+            if [[ -f "$target_dst_path" ]]; then
+              delete_file "$target_dst_path"
+            fi
+          fi
+        fi
+      done
+      # Delete the .delete folder in destination if it exists
+      delete_dst_path="$dest_dir/$rel_path"
+      if [[ -d "$delete_dst_path" ]]; then
+        delete_dir "$delete_dst_path"
+      fi
+      continue
+    fi
+
+    # Skip anything inside a .delete directory - don't process or copy
+    if is_in_delete_dir "$rel_path"; then
+      continue
+    fi
+
     dst_path="$dest_dir/$rel_path"
 
     if [[ -d "$src_path" ]]; then
+      # Check if there's a .delete marker for this directory
+      if check_delete_marker "$rel_path"; then
+        if [[ -d "$dst_path" ]]; then
+          delete_dir "$dst_path"
+          deleted_dirs+=("$dst_path")
+        fi
+        continue
+      fi
+
       if ! $dry_run; then
         mkdir -p "$dst_path"
       else