feat: expand file patterns for modelfile ignore and docs

Add support for additional file types:
- Include .patch files in ignored patterns
- Add .pdf files to documentation patterns

Signed-off-by: Zhao Chen <zhaochen.zju@gmail.com>

Author: aftersnow

pkg/modelfile/modelfile.go

@@ -150,13 +150,15 @@ var (
 		"*.py",    // Python source files
 		"*.sh",    // Shell scripts
 		"*.ipynb", // Jupyter notebooks
+		"*.patch", // Patch files
 	}
 
 	// Doc file patterns - supported documentation files
 	docFilePatterns = []string{
 		// Documentation files
 		"*.txt",          // Text files
 		"*.md",           // Markdown documentation
+		"*.pdf",          // PDF files
 		"LICENSE*",       // License files
 		"README*",        // Project documentation
 		"SETUP*",         // Setup instructions