feat: allow --list to accept item IDs for filtering

- Local and client/server modes now support ID-based filtering
- keep -l 1 2 3 lists specific items by ID
- keep -l --ids-only 1 2 3 outputs just those IDs
- Server API adds optional 'ids' query parameter to GET /api/item/
- KeepClient.list_items gains ids parameter

src/modes/client/list.rs

@@ -10,6 +10,7 @@ pub fn mode(
     client: &KeepClient,
     _cmd: &mut Command,
     settings: &crate::config::Settings,
+    ids: &[i64],
     tags: &[String],
 ) -> Result<(), anyhow::Error> {
     debug!("CLIENT_LIST: Listing items via remote server");
@@ -19,7 +20,7 @@ pub fn mode(
         .iter()
         .map(|(k, v)| (k.clone(), v.clone()))
         .collect();
-    let items = client.list_items(tags, "newest", 0, 100, &meta_filter)?;
+    let items = client.list_items(ids, tags, "newest", 0, 100, &meta_filter)?;
 
     if settings.ids_only {
         for item in &items {