Support dynamic source factors in platform runtime

crates/fidc-core/src/data.rs

@@ -176,6 +176,8 @@ pub struct DailyFactorSnapshot {
     pub pe_ttm: f64,
     pub turnover_ratio: Option<f64>,
     pub effective_turnover_ratio: Option<f64>,
+    #[serde(default)]
+    pub extra_factors: BTreeMap<String, f64>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -938,6 +940,12 @@ fn read_factors(path: &Path) -> Result<Vec<DailyFactorSnapshot>, DataSetError> {
             pe_ttm: row.parse_f64(4)?,
             turnover_ratio: row.parse_optional_f64(5),
             effective_turnover_ratio: row.parse_optional_f64(6),
+            extra_factors: row
+                .fields
+                .get(7)
+                .filter(|value| !value.trim().is_empty())
+                .and_then(|value| serde_json::from_str::<BTreeMap<String, f64>>(value).ok())
+                .unwrap_or_default(),
         });
     }
     Ok(snapshots)