Add Google Analytics, Dotfile, Segment and Square access-review connectors

Two OAuth2 and two API-key connectors:

- Google Analytics (GA4): OAuth2 with both analytics.readonly and
  analytics.manage.users.readonly (readonly alone 403s on the accounts
  list); v1alpha accessBindings enumerated at account and property level
  and merged by email; manual account picker (Pattern 1) with a
  per-connection probe and name resolver; distinct from Google Workspace.
- Dotfile: API key in the X-DOTFILE-API-KEY header (Pattern 3); GET
  /v1/users (owner/admin, suspended_at) with a static probe.
- Segment (Twilio): Public API token as Bearer with a required Region
  setting (US or EU) mapped to the regional host; GET /users plus per-user
  GET /users/{id} for roles and /invites for pending members; per-connection
  BuildProbeURL.
- Square: OAuth2 (EMPLOYEES_READ) or a personal access token (Pattern 3);
  POST /v2/team-members/search returns email/status/is_owner directly, so no
  role resolution; custom probe and name resolver.

Google Analytics and Square are confidential OAuth clients, wired into the
bootstrap OAuth provider list and .env.example. Segment carries a required
extra setting, so the console add-source dialog maps region onto its
segmentRegion API-key input; without that mapping the value is silently
dropped and the create is rejected.

Cassette-backed driver tests plus unit tests for the Segment probe URL and
the bootstrap OAuth provider list.

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

pkg/accessreview/drivers/dotfile_test.go

@@ -0,0 +1,63 @@
+// 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 drivers
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDotfileDriver(t *testing.T) {
+	t.Parallel()
+
+	rec := newRecorder(t, "testdata/dotfile", "DOTFILE_API_KEY")
+	// Dotfile authenticates via the X-DOTFILE-API-KEY header, not Authorization.
+	client := newVCRClientWithHeader(rec, "X-DOTFILE-API-KEY", os.Getenv("DOTFILE_API_KEY"))
+
+	driver := NewDotfileDriver(client)
+	records, err := driver.ListAccounts(context.Background())
+	require.NoError(t, err)
+	require.Len(t, records, 3)
+
+	// Owner: active, admin, id-first ExternalID, first+last name joined.
+	owner := records[0]
+	assert.Equal(t, "a1b2c3d4-0000-4000-8000-000000000001", owner.ExternalID)
+	assert.Equal(t, "alice.martin@example.com", owner.Email)
+	assert.Equal(t, "Alice Martin", owner.FullName)
+	assert.True(t, owner.IsAdmin)
+	require.NotNil(t, owner.Active)
+	assert.True(t, *owner.Active)
+	assert.Equal(t, []string{"owner"}, owner.Roles)
+
+	// Admin: also administrative.
+	admin := records[1]
+	assert.Equal(t, "bob.durand@example.com", admin.Email)
+	assert.True(t, admin.IsAdmin)
+	assert.Equal(t, []string{"admin"}, admin.Roles)
+	require.NotNil(t, admin.Active)
+	assert.True(t, *admin.Active)
+
+	// Member: suspended (suspended_at set) → inactive, not admin.
+	member := records[2]
+	assert.Equal(t, "carla.petit@example.com", member.Email)
+	assert.False(t, member.IsAdmin)
+	assert.Equal(t, []string{"member"}, member.Roles)
+	require.NotNil(t, member.Active)
+	assert.False(t, *member.Active)
+}