Fresh-install and upgrade readiness for the Search API reference topology.
• Adds a guided, one-time Initial Corpus binding for a new installation. Operators can connect a prepared AI Search index, source bundle, embedding provider/model, vector provider, and collection base before starting the normal candidate lifecycle.
• Adds package-bundled, checksum-verified support assets for the temporary AI Search and Qdrant compatibility patches. No external patch URL is required during supported setup.