Add four API-key access-review connectors

Add Pylon, OpenRouter, incident.io and Brevo as access-review connectors.
All are API-key, single-tenant providers (Pattern 3): the key identifies
one tenant, so there is no OAuth flow, picker UI, or bootstrap/helm
configuration.

- Pylon: Bearer token, GET /users; resolves each user's opaque role_id to
  a role name via GET /user-roles, with cursor pagination.
- OpenRouter: Bearer management key, GET /api/v1/organization/members. The
  endpoint requires an organization account -- a personal key authenticates
  but returns 404 -- so the connection probe rejects 404 on top of 401/403
  (doProbeRequest gained an opt-in extra-reject set) to surface a non-org
  key at connect time instead of mid-campaign.
- incident.io: Bearer token, GET /v2/users. Its OAuth is outbound-only, so
  the API key is the inbound path; live base_role/custom_roles take
  precedence over the deprecated role enum.
- Brevo: API key in the api-key header (Registration.APIKeyHeader), GET
  /v3/organization/invited/users. A live recording corrected the documented
  schema: is_owner is a JSON boolean (not a string) and an id field is
  present, so it is used as the stable ExternalID.

The OpenRouter and Brevo cassettes are anonymized live recordings; Pylon
and incident.io use hand-authored fixtures (no self-serve test tenant). The
shared three-valued active-status mapping is consolidated into
activeFromStatus in driver.go.

Each adds the enum value, migration, GraphQL binding, provider
Registration, a driver with a cassette-driven test, and a brand logo.

Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>

pkg/connector/provider/pylon.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+package provider
+
+import (
+	"context"
+	"net/http"
+
+	"go.gearno.de/kit/log"
+	"go.probo.inc/probo/pkg/accessreview/drivers"
+	"go.probo.inc/probo/pkg/coredata"
+)
+
+func pylonRegistration() *Registration {
+	return &Registration{
+		Provider:       coredata.ConnectorProviderPylon,
+		DisplayName:    "Pylon",
+		SupportsAPIKey: true,
+		// Pylon authenticates with an account API token presented as
+		// Authorization: Bearer, the default APIKeyConnection scheme. There
+		// is no third-party OAuth2 flow for the Users API. The token is bound
+		// to one Pylon organization, so there is nothing to pick (Pattern 3):
+		// no settings struct, no picker, no SetOrganizationSettings.
+		//
+		// ProbeURL lets the connection-status check confirm the token is live
+		// with a lightweight GET; the transport attaches the Bearer token and
+		// a dead token returns 401/403.
+		ProbeURL: "https://api.usepylon.com/users?limit=1",
+		//
+		// No NewNameResolver: GET /users carries no organization name, so the
+		// source keeps its generic name (the source-name worker degrades
+		// gracefully).
+		NewDriver: func(_ context.Context, c *http.Client, _ *coredata.Connector, _ *log.Logger) (drivers.Driver, error) {
+			return drivers.NewPylonDriver(c), nil
+		},
+	}
+}