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/api/routes/test_login.py

@@ -4,11 +4,11 @@ from fastapi.testclient import TestClient
 from pwdlib.hashers.bcrypt import BcryptHasher
 from sqlmodel import Session
 
-from app.core.config import settings
-from app.core.security import get_password_hash, verify_password
-from app.crud import create_user
-from app.models import User, UserCreate
-from app.utils import generate_password_reset_token
+from fluksio.core.config import settings
+from fluksio.core.security import get_password_hash, verify_password
+from fluksio.crud import create_user
+from fluksio.models import User, UserCreate
+from fluksio.utils import generate_password_reset_token
 from tests.utils.user import user_authentication_headers
 from tests.utils.utils import random_email, random_lower_string
 
@@ -50,8 +50,8 @@ def test_recovery_password(
     client: TestClient, normal_user_token_headers: dict[str, str]
 ) -> None:
     with (
-        patch("app.core.config.settings.SMTP_HOST", "smtp.example.com"),
-        patch("app.core.config.settings.SMTP_USER", "admin@example.com"),
+        patch("fluksio.core.config.settings.SMTP_HOST", "smtp.example.com"),
+        patch("fluksio.core.config.settings.SMTP_USER", "admin@example.com"),
     ):
         email = "test@example.com"
         r = client.post(