Docs: sharpen Install tab to stop duplicating Getting Started (#10416)

* docs(install): reframe install overview to stop duplicating getting started

* docs(install): link default installer row to getting started, not internals

* docs(install): use Mintlify components for install overview

* docs(install): fix card grid layout with CardGroup

* docs(install): platform tabs for global install, npm/pnpm as accordion

* docs(install): add PowerShell no-onboard alternative

* docs(install): add repo link to from-source clone step

* docs(install): capitalize OpenClaw in repo link

* docs(install): add pnpm link --global to from-source steps

* docs(install): rewrite install overview for clarity and flow

* docs(install): use tooltip for Windows WSL2 recommendation

* docs(install): use Note box for Windows WSL2 recommendation

* docs(install): group install methods under single heading

* docs(install): standardize tab labels across installer sections

* docs(install): rewrite Node.js page with install instructions and better structure

* docs(install): clarify Node.js page intro

* docs(install): scope auto-install note to installer script, link Node page

* docs(install): fix installer script link to internals page

* docs: rename Install methods nav group to Other install methods

* docs(install): link to on-page anchor, use Tip box for recommended

* docs(install): wrap install methods in AccordionGroup with Tip box

* docs: move Node.js page from Install to Help > Environment and debugging

* docs(install): add complete flags and env vars reference to installer internals

* docs(install): use stable troubleshooting anchor for Node.js link

* docs(install): fix Node page installer anchor

* docs(install): fix broken installer script anchor in requirements note

docs/docs.json

@@ -801,14 +801,8 @@
                 "pages": ["install/index", "install/installer"]
               },
               {
-                "group": "Install methods",
-                "pages": [
-                  "install/node",
-                  "install/docker",
-                  "install/nix",
-                  "install/ansible",
-                  "install/bun"
-                ]
+                "group": "Other install methods",
+                "pages": ["install/docker", "install/nix", "install/ansible", "install/bun"]
               },
               {
                 "group": "Maintenance",
@@ -1221,6 +1215,7 @@
               {
                 "group": "Environment and debugging",
                 "pages": [
+                  "install/node",
                   "environment",
                   "debugging",
                   "testing",