feat: use LTS Node.js version for installation

- Replace hardcoded setup_24.x with setup_lts.x for Linux apt/dnf/yum
- Update Windows installer to use Node.js 22 LTS with dynamic version fetch
- Update install messages to reflect LTS instead of specific version
- Fixes: Node.js 24+ requirement causing installation failures on some systems
- Ensures latest LTS version (20.x, 22.x) is used instead of bleeding edge

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

claude/uclaude_updater.py

@@ -125,7 +125,7 @@ def install_node():
         return False
 
     # Linux — nodesource
-    print(f"  Installing Node.js v24 via nodesource...")
+    print(f"  Installing Node.js LTS via nodesource...")
     try:
         # Remove old nodesource list if present (prevents version conflicts)
         for old_list in ["/etc/apt/sources.list.d/nodesource.list"]:
@@ -133,7 +133,7 @@ def install_node():
                 os.remove(old_list)
 
         result = run_cmd(
-            ["bash", "-c", "curl -fsSL https://deb.nodesource.com/setup_24.x | bash - && apt-get remove -y nodejs || true && apt-get install -y nodejs"],
+            ["bash", "-c", "curl -fsSL https://deb.nodesource.com/setup_lts.x | bash - && apt-get remove -y nodejs || true && apt-get install -y nodejs"],
             timeout=180, capture_output=True, text=True,
         )
         if result.returncode == 0:
@@ -148,7 +148,7 @@ def install_node():
         for pkg_mgr in ["dnf", "yum"]:
             if shutil.which(pkg_mgr):
                 result = run_cmd(
-                    ["bash", "-c", f"curl -fsSL https://rpm.nodesource.com/setup_24.x | bash - && {pkg_mgr} install -y nodejs"],
+                    ["bash", "-c", f"curl -fsSL https://rpm.nodesource.com/setup_lts.x | bash - && {pkg_mgr} install -y nodejs"],
                     timeout=180, capture_output=True, text=True,
                 )
                 if result.returncode == 0: