fix(ollama): fix macOS segfault and exclude mlx/rocm/jetpack variants

- pkg_link called webi_link which called pkg_link — infinite recursion
  causing SIGSEGV on macOS; fixed by switching to WEBI_SINGLE-style paths
  so the template's webi_link handles symlinking directly
- macOS pkg_src now points to the flat ollama binary (not ./bin/ollama)
- mlx, rocm, jetpack5, jetpack6 tagged as variants so generic installs
  get the standard build instead of a GPU-specific one

internal/releases/ollama/variants.go

@@ -1,7 +1,4 @@
 // Package ollama provides variant tagging for Ollama releases.
-//
-// Ollama publishes GPU accelerator builds: -rocm (AMD), -jetpack5
-// and -jetpack6 (NVIDIA Jetson).
 package ollamadist
 
 import (
@@ -11,14 +8,10 @@ import (
 )
 
 // TagVariants tags ollama-specific build variants.
+// Suffix variants (mlx, rocm, jetpack5, jetpack6) are handled by the
+// conf-driven loop in classifypkg.TagVariants; this handles the rest.
 func TagVariants(assets []storage.Asset) {
 	for i := range assets {
-		lower := strings.ToLower(assets[i].Filename)
-		for _, v := range []string{"rocm", "jetpack5", "jetpack6"} {
-			if strings.Contains(lower, "-"+v) {
-				assets[i].Variants = append(assets[i].Variants, v)
-			}
-		}
 		// Ollama-darwin.zip (capital O) is the macOS .app bundle.
 		// Installable by Go (extract .app), but not in legacy cache.
 		if strings.HasPrefix(assets[i].Filename, "Ollama-") {