fix: resolve latest release tag from GitHub API in installer

Author: Kingson4Wu

install.sh

@@ -37,14 +37,29 @@ command -v uv >/dev/null 2>&1 || {
 }
 UV_BIN="$(command -v uv)"
 
-# 2. resolve the release tag (follow the /releases/latest redirect; no jq needed)
+# 2. resolve the release tag (GitHub API is used first; fallback keeps old behaviour).
 if [ "$VERSION" = "latest" ]; then
-  url=$(curl -fsSLI -o /dev/null -w '%{url_effective}' \
-    "https://github.com/$REPO/releases/latest") || {
+  api_response="$(mktemp)"
+  if ! curl -fsSL \
+    -H "Accept: application/vnd.github+json" \
+    -H "User-Agent: git-auto-sync-installer" \
+    "https://api.github.com/repos/$REPO/releases/latest" \
+    -o "$api_response"; then
+    rm -f "$api_response"
     err "Couldn't reach GitHub to resolve the latest release."
     exit 1
-  }
-  TAG="${url##*/}"
+  fi
+  TAG="$(sed -n 's/.*"tag_name"[[:space:]]*:[[:space:]]*"\\([^"]*\\)".*/\\1/p' "$api_response" | head -n 1)"
+  rm -f "$api_response"
+  if [ -z "$TAG" ] || [ "${TAG#v}" = "$TAG" ]; then
+    info "GitHub API did not return a release tag, falling back to web redirect resolution."
+    url="$(curl -fsSLI -o /dev/null -w '%{url_effective}' \
+      "https://github.com/$REPO/releases/latest")" || {
+      err "Couldn't resolve the latest release."
+      exit 1
+    }
+    TAG="${url##*/}"
+  fi
 else
   TAG="$VERSION"
 fi