feat(keycloak): M4.3 — Admin API adapter + claim resolver

internal/keycloak Adapter (HTTPAdapter + Mock). POST /v1/tenants now provisions a KC organization + IT_ADMIN invite when admin_email is set; KC failures emit keycloak.provision_failed but don't roll back. POST /v1/internal/keycloak/claims resolves the current claim bundle for any (tenant_id|tenant_slug|user_attrs.*) lookup. Mock used in tests + when KEYCLOAK_ADMIN_URL is empty. HTTPAdapter tested against an in-process stub KC (httptest.Server).

Refs: M4.3

internal/keycloak/mock.go

@@ -0,0 +1,68 @@
+package keycloak
+
+import (
+	"context"
+	"errors"
+	"sync"
+)
+
+// Mock is the test-friendly Adapter. Records every call; predictable IDs.
+// Use in unit tests + as the default adapter when KEYCLOAK_BASE_URL is empty
+// (dev convenience).
+type Mock struct {
+	mu       sync.Mutex
+	Orgs     map[string]string // tenantID → orgID
+	Users    map[string]string // email → userID
+	Claims   map[string]Claims // userID → last synced
+	FailNext error             // set to force the next call to fail
+}
+
+func NewMock() *Mock {
+	return &Mock{
+		Orgs:   map[string]string{},
+		Users:  map[string]string{},
+		Claims: map[string]Claims{},
+	}
+}
+
+func (m *Mock) Health(_ context.Context) error { return nil }
+
+func (m *Mock) CreateOrgAndInvite(_ context.Context, in InviteInput) (*InviteResult, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.FailNext != nil {
+		err := m.FailNext
+		m.FailNext = nil
+		return nil, err
+	}
+	if _, taken := m.Orgs[in.TenantID]; taken {
+		return nil, ErrOrgConflict
+	}
+	if _, taken := m.Users[in.AdminEmail]; taken {
+		return nil, ErrUserConflict
+	}
+	orgID := "mock-org-" + in.Slug
+	userID := "mock-user-" + in.AdminEmail
+	m.Orgs[in.TenantID] = orgID
+	m.Users[in.AdminEmail] = userID
+	return &InviteResult{
+		OrganizationID: orgID,
+		UserID:         userID,
+		InviteURL:      "http://mock-keycloak/invite/" + userID,
+	}, nil
+}
+
+func (m *Mock) SyncClaims(_ context.Context, userID string, c Claims) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if m.FailNext != nil {
+		err := m.FailNext
+		m.FailNext = nil
+		return err
+	}
+	if userID == "" {
+		return errors.New("mock: user_id required")
+	}
+	m.Claims[userID] = c
+	return nil
+}