Improve local MCP auth flow, tool metadata, and sandbox validation#24

vladimir-tikhonov-nutrient merged 3 commits intomainPSPDFKit/nutrient-dws-mcp-server:mainfrom

fix/stdio-oauth-startup-cli-flagsPSPDFKit/nutrient-dws-mcp-server:fix/stdio-oauth-startup-cli-flagsCopy head branch name to clipboard