feat(server): add OIDC logout URL override option (#27389)

* feat(server): add OIDC logout URL override option
- Added toggle and field consistent with existing mobile redirect URI override.
- Existing auto-discovery remains default.
- Update tests and docs for new feature.

* fix(server): changes from review for OIDC logout URL override
- Rename 'logoutUri' to 'endSessionEndpoint'
- Remove toggle, just use override if provided
- Moved field in settings UI

open-api/immich-openapi-specs.json

@@ -24331,6 +24331,10 @@
             "description": "Enabled",
             "type": "boolean"
           },
+          "endSessionEndpoint": {
+            "description": "End session endpoint",
+            "type": "string"
+          },
           "issuerUrl": {
             "description": "Issuer URL",
             "type": "string"
@@ -24390,6 +24394,7 @@
           "clientSecret",
           "defaultStorageQuota",
           "enabled",
+          "endSessionEndpoint",
           "issuerUrl",
           "mobileOverrideEnabled",
           "mobileRedirectUri",

open-api/typescript-sdk/src/fetch-client.ts

@@ -2518,6 +2518,8 @@ export type SystemConfigOAuthDto = {
     defaultStorageQuota: number | null;
     /** Enabled */
     enabled: boolean;
+    /** End session endpoint */
+    endSessionEndpoint: string;
     /** Issuer URL */
     issuerUrl: string;
     /** Mobile override enabled */