docs: update OpenClaw integration guide (#498)

* docs: update OpenClaw integration guide

- Install section: npm only, removed InstallTabs snippet
- Step 2: removed smoke test (actionbook search)
- Step 3: removed "search -> get -> operate" workflow reference
- Next Steps: updated card description

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: revert steps 2-3 changes, keep only npm install update

Only the installation section should change per updated request.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: update InstallTabs snippet to npm-only install

Update the shared install-tabs.mdx snippet to only show npm install
method. Reverts inline change to openclaw.mdx — keeps the import.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

docs/snippets/install-tabs.mdx

@@ -1,27 +1,4 @@
-<Tabs>
-  <Tab title="Shell Script (macOS/Linux)">
-    ```bash
-    curl -fsSL https://actionbook.dev/install.sh | bash
-    ```
-    Re-run the same command to upgrade.
-  </Tab>
-  <Tab title="npm">
-    ```bash
-    npm install -g @actionbookdev/cli
-    ```
-    Requires Node.js >= v18. Upgrade with `npm install -g @actionbookdev/cli@latest`.
-  </Tab>
-  <Tab title="Homebrew (macOS/Linux)">
-    ```bash
-    brew tap actionbook/tap
-    brew install actionbook
-    ```
-    Upgrade later with `brew upgrade actionbook`.
-  </Tab>
-  <Tab title="PowerShell (Windows)">
-    ```powershell
-    irm https://actionbook.dev/install.ps1 | iex
-    ```
-    Re-run the same command to upgrade.
-  </Tab>
-</Tabs>
+```bash
+npm install -g @actionbookdev/cli
+```
+Requires Node.js >= v18. Upgrade with `npm install -g @actionbookdev/cli@latest`.