Rename OIDC strategy from :rauthy to :oidc, update callback path

- Rename AshAuthentication strategy from :oidc :rauthy to :oidc :oidc;
  generated actions are now register_with_oidc / sign_in_with_oidc.
- Update config keys (:rauthy → :oidc) in dev.exs and runtime.exs.
- Update default_redirect_uri to /auth/user/oidc/callback everywhere.
- Rename Mv.Accounts helper functions accordingly.
- Update Mv.Secrets, AuthController, link_oidc_account_live and all tests.
- Update docker-compose.prod.yml, .env.example, README and docs.

IMPORTANT: OIDC providers must be updated to use the new redirect URI
/auth/user/oidc/callback instead of /auth/user/rauthy/callback.

lib/mv/secrets.ex

@@ -7,7 +7,7 @@ defmodule Mv.Secrets do
   particularly for OIDC (Rauthy) authentication.
 
   ## Configuration Source
-  Secrets are read from the `:rauthy` key in the application configuration,
+  Secrets are read from the `:oidc` key in the application configuration,
   which is typically set in `config/runtime.exs` from environment variables:
   - `OIDC_CLIENT_ID`
   - `OIDC_CLIENT_SECRET`
@@ -21,7 +21,7 @@ defmodule Mv.Secrets do
   use AshAuthentication.Secret
 
   def secret_for(
-        [:authentication, :strategies, :rauthy, :client_id],
+        [:authentication, :strategies, :oidc, :client_id],
         Mv.Accounts.User,
         _opts,
         _meth
@@ -30,7 +30,7 @@ defmodule Mv.Secrets do
   end
 
   def secret_for(
-        [:authentication, :strategies, :rauthy, :redirect_uri],
+        [:authentication, :strategies, :oidc, :redirect_uri],
         Mv.Accounts.User,
         _opts,
         _meth
@@ -39,7 +39,7 @@ defmodule Mv.Secrets do
   end
 
   def secret_for(
-        [:authentication, :strategies, :rauthy, :client_secret],
+        [:authentication, :strategies, :oidc, :client_secret],
         Mv.Accounts.User,
         _opts,
         _meth
@@ -48,7 +48,7 @@ defmodule Mv.Secrets do
   end
 
   def secret_for(
-        [:authentication, :strategies, :rauthy, :base_url],
+        [:authentication, :strategies, :oidc, :base_url],
         Mv.Accounts.User,
         _opts,
         _meth
@@ -58,7 +58,7 @@ defmodule Mv.Secrets do
 
   defp get_config(key) do
     :mv
-    |> Application.fetch_env!(:rauthy)
+    |> Application.fetch_env!(:oidc)
     |> Keyword.fetch!(key)
     |> then(&{:ok, &1})
   end