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/tests/flow/test_connector.py

@@ -3,12 +3,12 @@
 import asyncio
 from typing import Any
 
-from app.flow.connector import CONTRACT_VERSION, ConnectorNode
-from app.flow.controller import NODE_TYPES
-from app.flow.messages import DType, MessageSpec
-from app.flow.nodes import Node
-from app.flow.pipeline import Pipeline
-from app.flow.plugins import load_plugins
+from fluksio.flow.connector import CONTRACT_VERSION, ConnectorNode
+from fluksio.flow.controller import NODE_TYPES
+from fluksio.flow.messages import DType, MessageSpec
+from fluksio.flow.nodes import Node
+from fluksio.flow.pipeline import Pipeline
+from fluksio.flow.plugins import load_plugins
 
 
 class Sensor(ConnectorNode):
@@ -146,7 +146,7 @@ def test_a_connector_is_discovered_from_its_entry_point(monkeypatch):
         def load(self):
             return Sensor
 
-    monkeypatch.setattr("app.flow.plugins.entry_points", lambda group: [FakeEntry()])
+    monkeypatch.setattr("fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()])
     try:
         assert load_plugins() == ["test_sensor"]
         assert NODE_TYPES["test_sensor"].plugin == "fluksio-connector-test 0.1.0"
@@ -166,7 +166,7 @@ def test_a_connector_written_for_another_contract_is_refused(monkeypatch):
         def load(self):
             return Outdated
 
-    monkeypatch.setattr("app.flow.plugins.entry_points", lambda group: [FakeEntry()])
+    monkeypatch.setattr("fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()])
     assert load_plugins() == []
     assert "outdated" not in NODE_TYPES
 
@@ -179,6 +179,6 @@ def test_a_connector_may_not_take_over_a_built_in_type(monkeypatch):
         def load(self):  # pragma: no cover - never reached
             raise AssertionError("should not be loaded")
 
-    monkeypatch.setattr("app.flow.plugins.entry_points", lambda group: [FakeEntry()])
+    monkeypatch.setattr("fluksio.flow.plugins.entry_points", lambda group: [FakeEntry()])
     assert load_plugins() == []
     assert NODE_TYPES["mqtt"].plugin is None