chore: prepare package for npm publish v2026.4.104}
- Bump version from 2026.4.100 to 2026.4.104 in package.json and README.md
- Add MIT LICENSE file
- Add .npmignore to exclude test, secure, agents, and config directories
- Rename npm package badge URLs from network-mcp to p3x-network-mcp
- Remove trailing blank line in .gitignore