Add debug/administration website for ngx_lua_cpp

[Copilot]

OpenResty-based debug console for executing Lua code interactively and viewing server logs. All files in web/.

web/nginx.conf

• API endpoints: /api/exec (POST, runs Lua code), /api/logs (GET, tail log files), /api/logs/clear, /api/info
• Lua execution sandbox with print() capture and return value display
• Log reading via pure Lua file I/O (no shell interpolation)
• Placeholder init_worker_by_lua_block for ngx_lua_cpp integration

web/index.html

• Self-contained SPA, zero external dependencies
• Left panel: Lua code editor with Ctrl+Enter execution, output history with success/error coloring
• Right panel: Error/access log viewer with line count control, log-level color coding, 5s auto-refresh toggle
• Header shows connection status, nginx version, ngx_lua_cpp state

Usage

# Adjust paths in nginx.conf, then:
openresty -p `pwd` -c nginx.conf
# Open http://localhost:8080

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