Rename the import package app to fluksio

A wheel whose top-level module is `app` collides with anything else in a
user's venv, so the package that is about to be published takes the name
it is published under. Only the Python package moves; the repo, the
Docker WORKDIR and the compose project keep theirs.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

backend/fluksio/mcp/__init__.py

@@ -0,0 +1,7 @@
+"""The MCP endpoint: the same flow API, in the shape an agent can drive.
+
+``server`` holds the tools, ``http`` wires them to the streamable-HTTP
+transport and the OAuth resource-server checks. Both are imported lazily, only
+when ``MCP_ENABLED`` is set, so an installation that does not want an agent
+endpoint does not carry one.
+"""