feat: add file upload for materials (PDF/DOCX) with ingestion pipeline

internal/ingestion/parse_docx.go

@@ -0,0 +1,20 @@
+package ingestion
+
+import (
+	"strings"
+
+	"github.com/nguyenthenguyen/docx"
+)
+
+func ParseDOCX(path string) (string, error) {
+	reader, err := docx.ReadDocxFile(path)
+	if err != nil {
+		return "", err
+	}
+	defer reader.Close()
+
+	doc := reader.Editable()
+	text := doc.GetContent()
+
+	return strings.TrimSpace(text), nil
+}