Add personal notes, DeepSearch history, backup offload, and gateway auth throttling

Also streamline the top navigation: drop the Tools dropdown, make Quizzes
and Battles icon-only entries, and remove the Workspace, Containers and
Editor entry points from the project detail page.

tests/unit/docs_api/_shared.py

@@ -0,0 +1,36 @@
+from devplacepy.docs_api import field, endpoint
+
+
+def test_field_defaults_nullable_false():
+    spec = field("username", "path", "string", True, "alice", "A username.")
+    assert spec["nullable"] is False
+
+
+def test_field_nullable_true_is_threaded_into_spec():
+    spec = field(
+        "avatar_seed",
+        "response",
+        "string",
+        description="Null falls back to the username.",
+        nullable=True,
+    )
+    assert spec["nullable"] is True
+    assert spec["location"] == "response"
+
+
+def test_endpoint_carries_response_field_specs_in_params():
+    ep = endpoint(
+        id="example",
+        method="GET",
+        path="/example",
+        title="Example",
+        summary="An example endpoint.",
+        auth="public",
+        params=[
+            field("uid", "response", "string", nullable=False),
+            field("bio", "response", "string", nullable=True),
+        ],
+    )
+    by_name = {p["name"]: p for p in ep["params"]}
+    assert by_name["uid"]["nullable"] is False
+    assert by_name["bio"]["nullable"] is True