Installation helper for adding PhoenixKit supervisor to parent application. Used by mix phoenix_kit.install task.

Important

PhoenixKit.Supervisor MUST start AFTER the Ecto Repo because it depends on the database for loading Settings cache and OAuth configuration.

Incorrect order (will crash):

children = [
  PhoenixKit.Supervisor,  # ❌ Tries to read Settings from DB
  MyApp.Repo              # ⚠️ DB not ready yet!
]

Correct order:

children = [
  MyApp.Repo,             # ✅ Start DB first
  PhoenixKit.Supervisor   # ✅ Then PhoenixKit
]