chore(deps): remove direct dependency on golang.org/x/exp

Signed-off-by: Deluan <deluan@navidrome.org>

go.mod

@@ -61,7 +61,6 @@ require (
 	github.com/unrolled/secure v1.17.0
 	github.com/xrash/smetrics v0.0.0-20250705151800-55b8f293f342
 	go.uber.org/goleak v1.3.0
-	golang.org/x/exp v0.0.0-20251209150349-8475f28825e9
 	golang.org/x/image v0.34.0
 	golang.org/x/net v0.48.0
 	golang.org/x/sync v0.19.0
@@ -130,6 +129,7 @@ require (
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/crypto v0.46.0 // indirect
+	golang.org/x/exp v0.0.0-20251209150349-8475f28825e9 // indirect
 	golang.org/x/mod v0.31.0 // indirect
 	golang.org/x/telemetry v0.0.0-20251203150158-8fff8a5912fc // indirect
 	golang.org/x/tools v0.40.0 // indirect

utils/number/number.go

@@ -2,11 +2,15 @@ package number
 
 import (
 	"strconv"
-
-	"golang.org/x/exp/constraints"
 )
 
-func ParseInt[T constraints.Integer](s string) T {
+// Integer is a constraint that permits any integer type.
+type Integer interface {
+	~int | ~int8 | ~int16 | ~int32 | ~int64 |
+		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr
+}
+
+func ParseInt[T Integer](s string) T {
 	r, _ := strconv.ParseInt(s, 10, 64)
 	return T(r)
 }

utils/random/number.go

@@ -5,12 +5,12 @@ import (
 	"encoding/binary"
 	"math/big"
 
-	"golang.org/x/exp/constraints"
+	"github.com/navidrome/navidrome/utils/number"
 )
 
 // Int64N returns a random int64 between 0 and max.
 // This is a reimplementation of math/rand/v2.Int64N using a cryptographically secure random number generator.
-func Int64N[T constraints.Integer](max T) int64 {
+func Int64N[T number.Integer](max T) int64 {
 	rnd, _ := rand.Int(rand.Reader, big.NewInt(int64(max)))
 	return rnd.Int64()
 }

utils/slice/slice.go

@@ -6,9 +6,8 @@ import (
 	"cmp"
 	"io"
 	"iter"
+	"maps"
 	"slices"
-
-	"golang.org/x/exp/maps"
 )
 
 func Map[T any, R any](t []T, mapFunc func(T) R) []R {
@@ -49,11 +48,9 @@ func CompactByFrequency[T comparable](list []T) []T {
 		counters[item]++
 	}
 
-	sorted := maps.Keys(counters)
-	slices.SortFunc(sorted, func(i, j T) int {
+	return slices.SortedFunc(maps.Keys(counters), func(i, j T) int {
 		return cmp.Compare(counters[j], counters[i])
 	})
-	return sorted
 }
 
 func MostFrequent[T comparable](list []T) T {