fix: address final review findings for foundation plan

- C1: drop module-level app singleton in app/main.py so importing the
  package no longer validates Settings or creates DATA_DIR; run uvicorn
  with --factory in the Dockerfile. pytest now collects and passes with
  no ambient env vars.
- I2: add missing app/auth, app/security, app/web __init__.py so
  setuptools discovers all five packages.
- I3: resolve the Jinja2 template directory relative to __file__ instead
  of the process CWD.
- I4: add .gitignore covering .env, data/, .venv/, caches and build
  artifacts so example deployment secrets cannot be committed.
- I5: assert UserRepository.list_enabled() excludes disabled users.
- M6: encode both operands before hmac.compare_digest in validate_csrf so
  a non-ASCII token yields 403 instead of an unhandled 500.
- M9: remove unused relationship / HealthState imports.
- M11: make session cookie https_only configurable via SESSION_HTTPS_ONLY
  (default unchanged: false).
- M13: dispose SQLAlchemy engines in the db_session and client fixtures.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/db/test_repositories.py

@@ -21,8 +21,20 @@ def test_create_two_independent_users(db_session, user_repository) -> None:
         garmin_password_enc="g-pw-2",
     )
 
+    disabled = user_repository.create(
+        name="Paused",
+        enabled=False,
+        health_state=HealthState.DISABLED,
+        mywhoosh_email_enc="mw-3",
+        mywhoosh_password_enc="mw-pw-3",
+        garmin_email_enc="g-3",
+        garmin_password_enc="g-pw-3",
+    )
+
     assert first.id != second.id
     assert {u.name for u in user_repository.list_enabled()} == {"Max", "Anna"}
+    assert disabled.id not in {u.id for u in user_repository.list_enabled()}
+    assert {u.name for u in user_repository.list_all()} == {"Max", "Anna", "Paused"}
 
 
 def test_activity_external_id_is_unique_per_user(user_repository, activity_repository) -> None: