AssetManager 0.5.5.27

Added the complete Apache License 2.0 license file.
Standardized the project license identifier to the SPDX value Apache-2.0.
Recreated the README for the current feature set and public repository release.
Added CONTRIBUTING.md, SECURITY.md, THIRD_PARTY_NOTICES.md, .gitignore, .dockerignore, .gitattributes, and .env.example.
Removed pure product-comparison references from public comments and older release notes.
Replaced internal server, domain, account, and path examples with neutral example data.
Added a public-source exporter that excludes databases, configuration, credentials, logs, backups, and uploads.
Added release validation for licensing, version consistency, sensitive files, and unwanted comparison references.
The Docker build now collects license files from the installed Python and Node.js dependencies.
MeshCentral and MeshCtrl are mentioned only where the actual technical integration is documented.
No application business logic was changed.