fix: resolve default_project returning null in cloud mode (#644)

In cloud mode, ConfigManager has no local config file so
default_project always returned None. Add async
get_default_project_name() on ProjectService that falls back
to the database is_default flag when ConfigManager returns None.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: phernandez <paul@basicmachines.co>

src/basic_memory/api/v2/routers/project_router.py

@@ -48,7 +48,7 @@ async def list_projects(
         A list of all projects with metadata
     """
     projects = await project_service.list_projects()
-    default_project = project_service.default_project
+    default_project = await project_service.get_default_project_name()
 
     project_items = [
         ProjectItem(

src/basic_memory/services/project_service.py

@@ -82,6 +82,21 @@ class ProjectService:
         """
         return self.config_manager.default_project
 
+    async def get_default_project_name(self) -> str:
+        """Get the default project name, falling back to the database.
+
+        ConfigManager reads from the local config file, which doesn't exist
+        in cloud mode. When it returns None, fall back to the is_default
+        flag stored in the database.
+        """
+        default = self.config_manager.default_project
+        if default is not None:
+            return default
+        db_default = await self.repository.get_default_project()
+        if db_default is not None:
+            return db_default.name
+        raise ValueError("No default project configured")
+
     @property
     def current_project(self) -> Optional[str]:
         """Get the name of the currently active project.