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/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
-name = "app"
+name = "fluksio"
 version = "0.1.0"
-description = ""
+description = "Node-based automation engine: flows, dashboards, batch runs"
 # Capped below 3.14: the MCP SDK wants a newer starlette there than the
 # pinned sentry-sdk allows. Lift it when sentry-sdk moves to 2.x.
 requires-python = ">=3.10,<3.14"
@@ -39,6 +39,9 @@ dev = [
     "coverage<8.0.0,>=7.4.3",
 ]
 
+[tool.hatch.build.targets.wheel]
+packages = ["fluksio"]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
@@ -47,7 +50,7 @@ build-backend = "hatchling.build"
 strict = true
 exclude = ["venv", ".venv", "alembic"]
 # influxdb_client's Point builder carries no annotations; calling it is not a
-# reason to stop checking the caller (app/flow/nodes/influx.py).
+# reason to stop checking the caller (fluksio/flow/nodes/influx.py).
 untyped_calls_exclude = ["influxdb_client"]
 
 # Every module is checked strictly. influxdb_client is typed but re-exports its
@@ -84,24 +87,24 @@ ignore = [
 [tool.ruff.lint.per-file-ignores]
 # Node functions take `params` whether or not they use it — that is the
 # contract the engine calls them with.
-"app/flow/nodes.py" = ["ARG001", "ARG002"]
+"fluksio/flow/nodes.py" = ["ARG001", "ARG002"]
 "tests/flow/*" = ["ARG001"]
 # Printing is what this one is about: node code is user code, and `print` is
 # how it says things.
 "tests/flow/test_logs.py" = ["ARG001", "T201"]
 # This one takes its own directory off sys.path before the rest of its imports
 # run, which is the whole point of doing it there.
-"app/flow/worker_main.py" = ["E402"]
+"fluksio/flow/worker_main.py" = ["E402"]
 # A standalone script copied onto another machine: it has no logger configured
 # before it tells you the one dependency it is missing.
-"app/worker/fluksio_worker.py" = ["T201"]
+"fluksio/worker/fluksio_worker.py" = ["T201"]
 
 [tool.ruff.lint.pyupgrade]
 # Preserve types, even if a file imports `from __future__ import annotations`.
 keep-runtime-typing = true
 
 [tool.coverage.run]
-source = ["app"]
+source = ["fluksio"]
 dynamic_context = "test_function"
 
 [tool.coverage.report]