chore: move csv_path_p, restructure modules

src/import/csv_parser.rs

@@ -4,6 +4,11 @@ use anyhow::{Context, Result};
 use csv::ReaderBuilder;
 use serde_json::Value;
 
+pub fn csv_path_p(path: &Path) -> bool {
+    path.extension()
+        .is_some_and(|ext| ext.eq_ignore_ascii_case("csv"))
+}
+
 /// Parse a CSV file and return records as serde_json::Value array
 pub fn parse_csv(path: &Path) -> Result<Vec<Value>> {
     let mut reader = ReaderBuilder::new()