Extensions 到 Installed Index

sequenceDiagram
participant UI
participant R as Repository
participant A as Wi-Fi Access
participant H as HTTP
participant S as Storage
participant I as Index
UI->>R: install
R->>A: lease
R->>H: download
R->>R: hash + safe zip
R->>S: extract + visible
R->>I: atomic record
R-->>UI: result