Add Neon access review driver support

Register Neon as a connector provider and add a new access review
driver that fetches organization members from the Neon API with
cursor-based pagination.

Neon's OAuth is partner-gated, so the connector is API-key only
(Bearer, the default scheme). A personal or organization API key can
belong to several organizations; the operator supplies the ID of the
one to review. The members endpoint exposes per-user MFA state
(has_mfa) and deactivation, which map to the access entry MFA status
and active flag; the stable account UUID (user_id) is used as the
external ID over the membership ID.

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

pkg/connector/provider/neon.go

@@ -0,0 +1,67 @@
+// 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"
+	"fmt"
+	"net/http"
+
+	"go.gearno.de/kit/log"
+	"go.probo.inc/probo/pkg/accessreview/drivers"
+	"go.probo.inc/probo/pkg/coredata"
+)
+
+func neonRegistration() *Registration {
+	return &Registration{
+		Provider:    coredata.ConnectorProviderNeon,
+		DisplayName: "Neon",
+		// Neon's API authenticates with an API key (napi_...) presented
+		// as Authorization: Bearer, the default APIKeyConnection scheme.
+		// Neon's OAuth is partner-gated (manual application), so the
+		// connector is API-key only. A personal or organization API key
+		// can belong to several organizations; the operator supplies the
+		// org ID (org-...) of the one to review.
+		//
+		// ProbeURL is intentionally empty: the connection probe runs only
+		// for OAuth2 connections, so it would be dead config for an
+		// API-key provider; a dead key surfaces on the first ListAccounts.
+		SupportsAPIKey: true,
+		ExtraSettings: []ExtraSetting{
+			{Key: "organizationId", Label: "Organization ID", Required: true},
+		},
+		NewDriver: func(_ context.Context, c *http.Client, conn *coredata.Connector, _ *log.Logger) (drivers.Driver, error) {
+			s, err := coredata.ConnectorSettings[coredata.NeonConnectorSettings](conn)
+			if err != nil {
+				return nil, fmt.Errorf("cannot read neon connector settings: %w", err)
+			}
+
+			if s.OrganizationID == "" {
+				return nil, fmt.Errorf("cannot create neon driver: organization_id is required")
+			}
+
+			return drivers.NewNeonDriver(c, s.OrganizationID), nil
+		},
+		NewNameResolver: func(ctx context.Context, c *http.Client, conn *coredata.Connector, logger *log.Logger) drivers.NameResolver {
+			s, err := coredata.ConnectorSettings[coredata.NeonConnectorSettings](conn)
+			if err != nil {
+				logger.ErrorCtx(ctx, "cannot read neon connector settings", log.Error(err))
+				return nil
+			}
+
+			return drivers.NewNeonNameResolver(c, s.OrganizationID)
+		},
+	}
+}