Ensure route validation is performed to detect ambiguous routes at initialization

In 2.0, we need to make sure function and proxy routes are validated on initialization to perform detection of ambiguous routes.

The issue names function and proxy routes but does not identify files, tests, or entry points. Locate the host's route initialization and validation areas, then verify that both route types are checked for ambiguity during initialization and that the behavior is covered by tests.

Written by the indexing model from the issue text.