docs: update README with new install usage

README.md

@@ -106,32 +106,30 @@ PaddedCell/
 └── README.zh-CN.md    # Chinese version
 ```
 
-## Development
+## Installation
 
 ```bash
-# Clone
-git clone https://git.hangman-lab.top/nav/PaddedCell.git
-cd PaddedCell
+# Install
+node install.mjs --install
 
-# Build pass_mgr (requires Go)
-cd pass_mgr
-go build -o pass_mgr src/main.go
-
-# Build pcexec (requires Node.js)
-cd ../pcexec
-npm install
-npm run build
-
-# Build safe-restart (requires Node.js)
-cd ../safe-restart
-npm install
-npm run build
+# Uninstall
+node install.mjs --uninstall
 ```
 
-## Branches
+## Usage
 
-- `main` - Main branch
-- `dev/zhi` - Development branch
+### pass_mgr
+
+```bash
+# Initialize (required before first use)
+~/.openclaw/bin/pass_mgr admin init
+
+# Set password
+~/.openclaw/bin/pass_mgr set mykey mypassword
+
+# Get password
+~/.openclaw/bin/pass_mgr get mykey
+```
 
 ## License