Planned and executed phase001

planning/phase004

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+# Phase 004: Fuel And Maintenance Event Entry
+
+## Goal
+Allow users to record fuel and maintenance events from the vehicle detail page.
+
+## Work
+- Add nested routes under vehicles for fuel entries and maintenance entries.
+- Add create forms on `vehicles#show`.
+- Save each fuel submission as a new `FuelEntry`.
+- Save each maintenance submission as a new `MaintenanceEntry`.
+- Update `Vehicle.current_odometer` when a fuel entry is created if the submitted odometer is newer.
+- Track `updated_by_user_id` on each event.
+- Add request specs and model specs for event creation.
+
+## Deliverables
+- Fuel entry creation flow.
+- Maintenance entry creation flow.
+- Odometer update behavior.
+- Event history display on vehicle show page.
+
+## Acceptance Criteria
+- Fuel submissions create records and update vehicle odometer.
+- Maintenance submissions create records.
+- Invalid submissions re-render or redirect with validation errors.
+- Every event records the submitting user.