server: order library root as crabidy first, orphans last, rest alphabetical

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crabidy-server/src/provider.rs

@@ -789,6 +789,18 @@ impl ProviderClient for ProviderOrchestrator {
             );
             root_node.children.push(child);
         }
+        // Ordering: `crabidy` always first, `orphans` always last, everything
+        // else alphabetically by name.
+        root_node.children.sort_by(|a, b| {
+            fn rank(name: &str) -> (u8, &str) {
+                match name {
+                    "crabidy" => (0, name),
+                    "orphans" => (2, name),
+                    _ => (1, name),
+                }
+            }
+            rank(&a.title).cmp(&rank(&b.title))
+        });
         root_node
     }