[PATCH v2 0/7] app: implement OpenID Connect (OAuth) realm login (#4281)

[Azharul Haque <haque@azharul.com>]

The native Flutter "Proxmox VE Companion" app never implemented OpenID
Connect / OAuth realm login (bug #4281[0]): selecting an OAuth realm
just showed username/password fields that could never work.

v2: resending as a single combined series across all three affected
repositories, per feedback -- each patch subject is now prefixed with
the (shortened) repository name it applies to. No functional changes
from v1.

This series spans three repositories and should be applied together:

  dart-api-client (2 patches):
    API-layer building blocks for OIDC login -- a `type` property on
    PveAccessDomainModel to detect OpenID realms, and helpers for
    PVE's /access/openid/auth-url and /access/openid/login endpoints.

  login-manager (3 patches):
    Login-form UI: hide username/password fields for OpenID realms
    and drive the OAuth flow via flutter_web_auth_2 (system browser /
    ASWebAuthenticationSession on iOS, Chrome Custom Tabs on Android
    -- deliberately not an in-app webview); a fix for a stale Continue
    button state when switching realms; and namespacing the OpenID
    redirect scheme under Proxmox's own reserved com.proxmox.*
    package prefix to avoid Android custom-URL-scheme collisions.

  flutter-frontend (2 patches):
    Android-side wiring: register flutter_web_auth_2's
    CallbackActivity in AndroidManifest.xml for the OpenID redirect
    scheme, and a follow-up fix to match a later rename of that
    scheme. No iOS-side changes are required here --
    ASWebAuthenticationSession resolves the custom-scheme redirect at
    runtime without a static declaration equivalent to the Android
    manifest entry.

Verified end-to-end against a real PVE server with an Authentik OIDC
realm, on both Android and iOS.

[0] https://bugzilla.proxmox.com/show_bug.cgi?id=4281

Azharul Haque (7):
  fix #4281: access: add `type` property to `PveAccessDomainModel`
  fix #4281: access: add OpenID Connect auth-url/login helpers
  fix #4281: ui: add OpenID Connect login flow to login form
  fix #4281: ui: fix stale Continue button state on realm switch
  fix #4281: ui: use a namespaced OpenID callback scheme
  fix #4281: android: register OpenID Connect callback activity
  fix #4281: android: match renamed OpenID callback scheme

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2.50.1 (Apple Git-155)