chore: add cross-platform MCP server configurations and bump version to 1.1.11

This commit enhances the Model Context Protocol (MCP) server configuration
for improved cross-platform compatibility and adds additional MCP servers.

Key changes:
- Added separate MCP server configurations for Unix and Windows platforms
  - shadcn-unix and shadcn-windows variants for proper command execution
  - playwright-unix and playwright-windows variants for browser automation
- Integrated Context7 MCP server with API key authentication
- Updated package version from 1.1.10 to 1.1.11
- Applied configuration updates to both root .mcp.json and template

Technical details:
- Windows configurations use 'cmd /c' wrapper to properly execute npx commands
- Unix configurations use direct 'npx' command execution
- Context7 server uses HTTPS URL endpoint with header-based authentication
- Changes apply to both the main project and create-agentic-app template

Breaking changes: None
Migration notes: Users will need to set their CONTEXT7_API_KEY if using Context7

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

create-agentic-app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "create-agentic-app",
-  "version": "1.1.10",
+  "version": "1.1.11",
   "description": "Scaffold a new agentic AI application with Next.js, Better Auth, and AI SDK",
   "type": "module",
   "bin": {