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Fix habit confirmation by adding @JsonIgnore to HabitEntry.habit (#613)

The bidirectional relationship between HabitEntry and Habit caused
infinite recursion during JSON serialization when the addEntry
endpoint returned a HabitEntry response. Jackson would serialize
HabitEntry → habit → entries → HabitEntry → habit → … resulting
in a StackOverflowError and HTTP 500 response, making it impossible
to confirm habits through the API.

Add @JsonIgnore to HabitEntry.habit field to break the circular
reference. The habitId is still exposed via the @Transient
getHabitId() accessor. Add a regression test verifying the
annotation is present.

https://claude.ai/code/session_01DxWQtweQPsYvQnSHZrbEqq

Co-authored-by: Claude <noreply@anthropic.com>

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