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, 4 insertions, 3 deletions

diff --git a/web/rides.go b/web/rides.go
index 71ab3fd..d3f5634 100644
--- a/web/rides.go
+++ b/web/rides.go
@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"strconv"
 
+	"github.com/martinlehoux/biking_home/climb"
 	"github.com/martinlehoux/biking_home/mountain_pass"
 	"github.com/martinlehoux/biking_home/official_climb"
 	"github.com/martinlehoux/biking_home/ride"
@@ -65,7 +66,7 @@ func (s *Server) handleRide(w http.ResponseWriter, r *http.Request) {
 		}), w)
 		return
 	}
-	passes, err := mountain_pass.LoadMountainPassesAroundRide(s.db, parsed.Coords(), rideDetailMountainPassMarginM)
+	passes, err := mountain_pass.LoadMountainPassesAroundRide(s.db, parsed.Coords, rideDetailMountainPassMarginM)
 	if err != nil {
 		slog.Warn("Failed to load nearby mountain passes for ride detail", "ride_id", id, "error", err)
 	}
@@ -144,7 +145,7 @@ func (s *Server) handleCreateOfficialClimb(w http.ResponseWriter, r *http.Reques
 		http.Error(w, "the recorded route is unavailable", http.StatusBadRequest)
 		return
 	}
-	bounds := parsed.Coords()
+	bounds := parsed.Coords
 	if startIndex >= endIndex || endIndex >= len(bounds) {
 		http.Error(w, "the official climb boundaries must be ordered route points", http.StatusBadRequest)
 		return
@@ -192,7 +193,7 @@ func buildRideViews(items []ride.StoredRide) []RideView {
 func buildRideView(item ride.StoredRide) RideView {
 	view := RideView{Ride: item, Cotacol: "-", CotacolPer100Km: "-", MovingTime: formatDuration(item.EffectiveMovingTimeS())}
 	cotacol, ready := item.CotacolScore()
-	if ready && item.CotacolAlgorithmVersion() == ride.CotacolAlgorithmVersion && item.DistanceM > 0 {
+	if ready && item.CotacolAlgorithmVersion() == climb.CotacolAlgorithmVersion && item.DistanceM > 0 {
 		view.Cotacol = formatCotacol(cotacol)
 		view.CotacolPer100Km = formatCotacolPer100Km(cotacol, item.DistanceM)
 	}