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/api/v1/trees.py

@@ -22,8 +22,13 @@ async def create_tree(data: TreeCreate, session: SessionDep, current: CurrentUse
 
 
 @router.get("", response_model=list[TreeRead])
-async def list_my_trees(session: SessionDep, current: CurrentUser) -> list[TreeRead]:
-    trees = await tree_service.list_trees_for_user(session, user=current)
+async def list_my_trees(
+    session: SessionDep, current: CurrentUser, deleted: bool = False
+) -> list[TreeRead]:
+    if deleted:
+        trees = await tree_service.list_deleted_trees_for_user(session, user=current)
+    else:
+        trees = await tree_service.list_trees_for_user(session, user=current)
     return [TreeRead.model_validate(t) for t in trees]
 
 
@@ -31,3 +36,14 @@ async def list_my_trees(session: SessionDep, current: CurrentUser) -> list[TreeR
 async def get_tree(tree_id: uuid.UUID, session: SessionDep, current: CurrentUser) -> TreeRead:
     tree = await tree_service.get_tree(session, viewer_id=current.id, tree_id=tree_id)
     return TreeRead.model_validate(tree)
+
+
+@router.delete("/{tree_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_tree(tree_id: uuid.UUID, session: SessionDep, current: CurrentUser) -> None:
+    await tree_service.delete_tree(session, actor=current, tree_id=tree_id)
+
+
+@router.post("/{tree_id}/restore", response_model=TreeRead)
+async def restore_tree(tree_id: uuid.UUID, session: SessionDep, current: CurrentUser) -> TreeRead:
+    tree = await tree_service.restore_tree(session, actor=current, tree_id=tree_id)
+    return TreeRead.model_validate(tree)