Add soft-delete + recovery and tree-wide graph endpoints

Tree and person soft-delete + restore (owner-only for trees, editor for people) with recovery listings (?deleted=true); the worker already purges past the 30-day window. Adds tree-wide GET /relationships and /events so the family/pedigree view loads the whole graph in a few calls. 27 tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>

backend/app/services/relationship_service.py

@@ -73,6 +73,20 @@ async def create_relationship(
     return relationship
 
 
+async def list_relationships(
+    session: AsyncSession, *, viewer_id: uuid.UUID, tree: Tree
+) -> list[Relationship]:
+    """All relationships in the tree — powers the family/pedigree view in one call."""
+    if not await privacy.can_view_tree(session, user_id=viewer_id, tree=tree):
+        raise Forbidden("not permitted to view this tree")
+    stmt = (
+        select(Relationship)
+        .where(Relationship.tree_id == tree.id, Relationship.deleted_at.is_(None))
+        .order_by(Relationship.created_at)
+    )
+    return list((await session.execute(stmt)).scalars().all())
+
+
 async def list_relationships_for_person(
     session: AsyncSession, *, viewer_id: uuid.UUID, tree: Tree, person_id: uuid.UUID
 ) -> list[Relationship]: