Extract climb detection into a dedicated climb package

Move climb detection, slope, and Cotacol scoring out of ride into a new
climb package that operates on a geometry-only Route (distances, elevations,
coords). Ride embeds climb.Route and keeps its timing and telemetry columns.

- climb.Detect returns []DetectedClimb (Climb + ride-absolute Start).
- Climb owns its sliced geometry; indices are local, with Start reported at
  the detection boundary for absolute position.
- Detected bounds use core.Interval; freeRegions claim suppression fixed.
- ride no longer builds slices: ClimbFromDist/ClimbFromIndexes/climbFrom and
  ride.Climb/Interval/Range are removed; rideanalysis, mountain_pass MatchClimb,
  and web views are rewired to climb types.
- New internal/routetest builds climb.Route from the ride DSL; ridetest reuses
  it and adds timestamps and telemetry.
- Tests moved to climb (synthetic detection and difficulty) and kept in ride
  for GPX-example integration; ride.comparison detection coverage retained.
- mountain_pass.nearestCrossing now reuses geo.Nearest.

1 files changed, 2 insertions, 1 deletions

diff --git a/web/ride-filters.go b/web/ride-filters.go
index 0bb97d8..8535756 100644
--- a/web/ride-filters.go
+++ b/web/ride-filters.go
@@ -6,6 +6,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/martinlehoux/biking_home/climb"
 	"github.com/martinlehoux/biking_home/ride"
 )
 
@@ -417,7 +418,7 @@ func rideMatchesFilters(item ride.StoredRide, filters RideFilters) bool {
 	}
 	if filters.CotacolMinPoints != nil || filters.CotacolMaxPoints != nil {
 		cotacol, ready := item.CotacolScore()
-		if !ready || item.CotacolAlgorithmVersion() != ride.CotacolAlgorithmVersion || item.DistanceM <= 0 {
+		if !ready || item.CotacolAlgorithmVersion() != climb.CotacolAlgorithmVersion || item.DistanceM <= 0 {
 			return false
 		}
 		if filters.CotacolMinPoints != nil && cotacol < float64(*filters.CotacolMinPoints) {