✨ feat(config): add EolRule struct for managing end-of-life rules

- introduce EolRule struct with fields for id, retention, labels, query, and command
- implement methods for creating new rules, setting retention, and adding labels
- add default implementation for EolRule

src/config/eol_rule.rs

@@ -0,0 +1,40 @@
+use serde::{Deserialize, Serialize};
+
+use crate::{Retention, eol_cmd::EolCmd};
+
+/// End of life rules
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub(crate) struct EolRule {
+    id: usize,
+    retention: String,
+    labels: Vec<String>,
+    query: Option<String>,
+    command: String,
+}
+
+impl EolRule {
+    pub(crate) fn new(id: usize) -> Self {
+        EolRule {
+            id,
+            command: EolCmd::Trash.to_string(),
+            ..Default::default()
+        }
+    }
+
+    pub(crate) fn set_retention(&mut self, value: Retention) -> &mut Self {
+        self.retention = value.age().to_string();
+        if value.generate_label() {
+            self.add_label(&value.age().label());
+        }
+        self
+    }
+
+    pub(crate) fn add_label(&mut self, value: &str) -> &mut Self {
+        self.labels.push(value.to_string());
+        self
+    }
+
+    pub(crate) fn id(&self) -> usize {
+        self.id
+    }
+}