feat: Add new nodes for text list processing and update documentation

web/docs/MultilineStringToList.md

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+# MultilineStringToList
+
+Convert a multiline string into a `LIST` with one item per line.
+
+## Inputs
+
+- `text`: The multiline string to split
+- `trim_whitespace`: Remove whitespace around each line; enabled by default
+- `keep_empty_lines`: Keep empty lines as empty string items; disabled by default
+
+## Behavior
+
+- Supports LF, CRLF, and CR line endings.
+- Empty input returns an empty list.
+- A trailing line ending does not add an empty item.
+- Lines that look like comments are kept as normal text.
+- When trimming is enabled, whitespace-only lines become empty before empty-line filtering.
+
+## Usage
+
+Use this node to enter prompt candidates directly in one text box and connect the resulting list to any TextListProduct node.