fix(webicached): add --tags to git fetch and modernize Go string ops

Bug fix:
- gittag: git fetch without --tags misses tags not reachable from
  any branch, causing stale version lists.

Modern Go (Go 1.24+):
- strings.SplitSeq instead of strings.Split for iteration
- strings.Cut/CutPrefix/CutSuffix instead of Index/HasPrefix/TrimSuffix
- min() builtin instead of manual min logic

Fix:
- node_test: pass required baseURL argument to nodedist.Fetch

internal/classify/classify_test.go

@@ -224,17 +224,17 @@ func TestFilename(t *testing.T) {
 
 		// amd64 micro-architecture levels
 		{
-			name: "amd64v2",
+			name:  "amd64v2",
 			input: "tool-linux-amd64v2.tar.gz",
 			arch:  buildmeta.ArchAMD64v2,
 		},
 		{
-			name: "amd64v3",
+			name:  "amd64v3",
 			input: "tool-linux-x86_64_v3.tar.gz",
 			arch:  buildmeta.ArchAMD64v3,
 		},
 		{
-			name: "amd64v4",
+			name:  "amd64v4",
 			input: "tool-linux-amd64v4.tar.gz",
 			arch:  buildmeta.ArchAMD64v4,
 		},
@@ -248,36 +248,36 @@ func TestFilename(t *testing.T) {
 
 		// ARM variants: arm64 must not match armv7/armv6
 		{
-			name: "aarch64 not armv7",
+			name:  "aarch64 not armv7",
 			input: "tool-aarch64-linux.tar.gz",
 			arch:  buildmeta.ArchARM64,
 		},
 		{
-			name: "armv7",
+			name:  "armv7",
 			input: "tool-armv7l-linux.tar.gz",
 			arch:  buildmeta.ArchARMv7,
 		},
 		{
-			name: "armv6",
+			name:  "armv6",
 			input: "tool-armv6l-linux.tar.gz",
 			arch:  buildmeta.ArchARMv6,
 		},
 
 		// ppc64le before ppc64
 		{
-			name: "ppc64le",
+			name:  "ppc64le",
 			input: "tool-linux-ppc64le.tar.gz",
 			arch:  buildmeta.ArchPPC64LE,
 		},
 		{
-			name: "ppc64",
+			name:  "ppc64",
 			input: "tool-linux-ppc64.tar.gz",
 			arch:  buildmeta.ArchPPC64,
 		},
 
 		// Static linking
 		{
-			name: "static binary",
+			name:  "static binary",
 			input: "tool-linux-amd64-static.tar.gz",
 			libc:  buildmeta.LibcNone,
 		},
@@ -315,12 +315,12 @@ func TestFilename(t *testing.T) {
 
 		// s390x, mips
 		{
-			name: "s390x",
+			name:  "s390x",
 			input: "tool-linux-s390x.tar.gz",
 			arch:  buildmeta.ArchS390X,
 		},
 		{
-			name: "mips64",
+			name:  "mips64",
 			input: "tool-linux-mips64.tar.gz",
 			arch:  buildmeta.ArchMIPS64,
 		},