Added SNS Boxplot node

docs/reference/sns_boxplot.md

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+# SNS Boxplot
+Generates a boxplot from a Pandas DataFrame using Seaborn.
+
+You can generate a boxplot from either a single column or two columns.  
+* For two columns, the first column should contain the category, and the second column should contain the corresponding numerical values.  
+* For a wide-format table, use the Pandas Melt node to create a category column first. This column is referred to as the "variable" column in melting.  
+* For a single-column dataset, leave the category field blank.
+
+For example, if you have a DataFrame tracking apple and banana prices at various stores:
+```
+ Fruit  Price
+ apple    5
+ apple    3
+ apple    2
+ appel    2.5
+ banana   4
+ banana   2
+ banana   2
+```
+If you specify `Fruit` as the category and `Price` as the value, two boxplots will be generated: one for apples and one for bananas.
+
+![Boxplot](../images/boxplot.png)
+
+Refer to [Seaborn documentation](https://seaborn.pydata.org/generated/seaborn.boxplot.html) for more information.
+
+## Input
+| Name | Data type |
+|---|---|
+| dataframe | DataFrame |
+| category_column_name | String |
+| value_column_name | String |
+| title | String |
+| style | String |
+| palette | String |
+
+## Output
+| Data type |
+|---|
+| Image |
+
+<HR>
+Category: Plot
+
+ComfyUI Data Analysis Node Reference. © 2025 Hide Inada (HowToSD.com). All rights reserved.