feat: preserve nested source projects across desktop and REST

crates/oa-server/tests/http.rs

@@ -8,6 +8,9 @@ use serde_json::{Value, json};
 use std::{path::Path, sync::Arc};
 use tokio::{sync::oneshot, task::JoinHandle};
 
+#[path = "http/source_projects.rs"]
+mod source_projects;
+
 fn v2_missing_ports() -> Value {
     let mut old: Value = serde_json::from_slice(include_bytes!(
         "../../oa-core/tests/fixtures/v2-coastal-rescue.json"
@@ -1590,6 +1593,7 @@ async fn failed_atomic_replacement_preserves_the_accepted_model() {
     let after = server.get(id).await;
     assert_eq!(after.revision, before.revision);
     assert_eq!(after.model, before.model);
+    assert_eq!(after.source_project, before.source_project);
     std::fs::remove_dir(&envelope).unwrap();
     std::fs::write(&envelope, bytes).unwrap();
     server.stop().await;
@@ -1605,19 +1609,23 @@ fn storage_rejects_second_owners_corruption_and_identity_mismatch() {
     let path = directory.path().join(format!("{filename}.json"));
     std::fs::write(&path, "{broken").unwrap();
     assert!(Store::open(directory.path()).is_err());
+    let model = Project::empty();
     let mismatched = StoredProject {
         migration: None,
         resource_id: Id::new_v4(),
         revision: 1,
-        model: Project::empty(),
+        source_project: oa_core::source_project::format_bundle(&model),
+        model,
     };
     std::fs::write(&path, serde_json::to_vec(&mismatched).unwrap()).unwrap();
     assert!(Store::open(directory.path()).is_err());
+    let model = Project::empty();
     let invalid = StoredProject {
         migration: None,
         resource_id: filename,
         revision: 0,
-        model: Project::empty(),
+        source_project: oa_core::source_project::format_bundle(&model),
+        model,
     };
     std::fs::write(&path, serde_json::to_vec(&invalid).unwrap()).unwrap();
     assert!(Store::open(directory.path()).is_err());
@@ -1773,11 +1781,13 @@ async fn fixed_store_capacity_is_enforced_on_http_and_restart() {
     let directory = tempfile::tempdir().unwrap();
     let mut last = None;
     for _ in 0..oa_server::store::MAX_PROJECTS {
+        let model = Project::empty();
         let envelope = StoredProject {
             migration: None,
             resource_id: Id::new_v4(),
             revision: 1,
-            model: Project::empty(),
+            source_project: oa_core::source_project::format_bundle(&model),
+            model,
         };
         std::fs::write(
             directory