"reflex db init" without the db extra dumps a raw click traceback instead of the guided "pip install reflex[db]" message

[masenf]

Describe the bug

#7083 added the guided ImportError ("pip install reflex[db]") when rx.Model is subclassed without the db extra, but the CLI path did not get it: on a bare reflex install, reflex db init exits 1 with a 35-line raw click traceback ending in the underlying ModuleNotFoundError.

To Reproduce

uv venv && uv pip install reflex          # no [db] extra
reflex init --template blank
reflex db init

Observed behavior

Raw traceback, exit code 1.

Expected behavior

The same guided message the model path prints, exit code 1.

Specifics

• Reflex 0.9.12a1; pre-existing, identical on 0.9.11.post1
• Python 3.11.15, Linux

Additional context

0.9.12a1 pre-release QA, db_optional_imports cluster, anomaly A2, confirmed by an adversarial verifier (LOW). Evidence: db_optional_imports/ (bareapp/, NOTES.md).

[linear-code]

ENG-12653