Refactor pick status logic into shared service

[mateu]

What

Extracted duplicate pick-status and winner-comparison logic into a shared Bracket::Service::PickStatus service, and switched Region/Final4/Admin code paths to consume it.

Why

Region, Final4, and Admin::player_points each reimplemented the same in/out/pending winner checks with small variations. That made behavior drift more likely and multiplied query overhead/maintenance cost.

How

Added PickStatus helpers for loading player picks, building pick maps, loading perfect-winner picks, and classifying each pick as in, out, or pending.
Replaced duplicated loops in Region::view, Final4::make, Final4::view, and Admin::player_points with service calls while preserving existing scoring formulas and templates.
Added a DB-backed t/pick_status.t to lock service behavior.

Testing

• script/test-env.sh prove -lv t/pick_status.t t/controller_Region.t t/bracket_validator.t
• script/test-env.sh prove -lr t

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Quality Report

Changes: 5 files changed, 151 insertions(+), 129 deletions(-)

Code scan: clean

Tests: skipped

Branch hygiene: clean

Generated by Kōan post-mission quality pipeline