feat(auth): OIDC/Keycloak SSO-Login (additiv) — v1.2.91

SSO per OpenID Connect (Authorization Code + PKCE) zusätzlich zum lokalen Login.
- Regeln: kein Auto-Provisioning (E-Mail muss als User existieren), Rolle aus DB (nie aus Token), lokaler Login+TOTP unangetastet.
- Migration 0040: oidc_settings (Singleton, client_secret_enc via secrets.Box) + users.oidc_subject.
- internal/services/oidc: Settings-Repo (write-only Secret) + lazy go-oidc Client (testbarer Authenticator-Seam).
- internal/handlers/oidc.go: GET/PUT /oidc/settings (admin), GET /auth/oidc/{settings,login,callback}. Flow-State (state/PKCE/nonce) stateless im 5-min signierten HttpOnly-Cookie (SameSite=Lax). email_verified erzwungen, opportunistisches sub-Linking, Session via setSessionCookie+Signer.
- session.SignBlob/VerifyBlob; users.Get/SetOIDCSubject; main.go-Wiring.
- Frontend: App.tsx /auth/me-Bootstrap (für Cookie-Session nach Callback), Login-SSO-Button + sso_error, Settings OIDC-Card, i18n de/en.
- Tests (guarded EG_FWTEST_DSN): Secret-Roundtrip + Callback (Rolle-aus-DB, no_account, disabled, unverified, nonce, state).
Deps: go-oidc/v3, x/oauth2. Scope v1: nur Login (kein SLO/Refresh).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

management-ui/src/pages/Settings/index.tsx

@@ -46,6 +46,27 @@ interface VIPSettingsValues {
   gw_check_ip?: string
 }
 
+interface OIDCSettingsView {
+  enabled: boolean
+  issuer_url: string
+  client_id: string
+  scopes: string
+  email_claim: string
+  button_label: string
+  secret_configured: boolean
+  redirect_uri: string
+}
+
+interface OIDCFormValues {
+  enabled: boolean
+  issuer_url: string
+  client_id: string
+  client_secret?: string
+  scopes: string
+  email_claim: string
+  button_label: string
+}
+
 export default function SettingsPage() {
   const { t } = useTranslation()
   const qc = useQueryClient()
@@ -93,6 +114,41 @@ export default function SettingsPage() {
     onError: (e: Error) => msg.error(t('cluster.vipCard.saveFailed') + ': ' + e.message),
   })
 
+  const [oidcForm] = Form.useForm<OIDCFormValues>()
+  const { data: oidc } = useQuery({
+    queryKey: ['oidc', 'settings'],
+    queryFn: async () => {
+      const r = await apiClient.get('/oidc/settings')
+      return isEnvelope(r.data) ? r.data.data as OIDCSettingsView : null
+    },
+  })
+  useEffect(() => {
+    if (oidc) {
+      oidcForm.setFieldsValue({
+        enabled: oidc.enabled,
+        issuer_url: oidc.issuer_url,
+        client_id: oidc.client_id,
+        scopes: oidc.scopes,
+        email_claim: oidc.email_claim,
+        button_label: oidc.button_label,
+        client_secret: '',
+      })
+    }
+  }, [oidc, oidcForm])
+  const updateOIDC = useMutation({
+    mutationFn: async (v: OIDCFormValues) => {
+      const body: Record<string, unknown> = { ...v }
+      // leeres Secret = unverändert → Feld weglassen (Backend: nil)
+      if (!v.client_secret) delete body.client_secret
+      return apiClient.put('/oidc/settings', body)
+    },
+    onSuccess: () => {
+      msg.success(t('settings.oidc.saved'))
+      void qc.invalidateQueries({ queryKey: ['oidc', 'settings'] })
+    },
+    onError: (e: Error) => msg.error(t('settings.oidc.saveFailed') + ': ' + e.message),
+  })
+
   const [emailForm] = Form.useForm<ContactEmailValues>()
   const updateEmails = useMutation({
     mutationFn: async (v: ContactEmailValues) => {
@@ -879,6 +935,49 @@ export default function SettingsPage() {
         </Form>
       </Card>
 
+      <Card title={<><GlobalOutlined /> {t('settings.oidc.title')}</>} className="mb-12" size="small">
+        <Typography.Paragraph type="secondary" style={{ marginBottom: 12 }}>
+          {t('settings.oidc.intro')}
+        </Typography.Paragraph>
+        <Form<OIDCFormValues> form={oidcForm} layout="vertical" onFinish={(v) => updateOIDC.mutate(v)}>
+          <Form.Item label={t('settings.oidc.enabled')} name="enabled" valuePropName="checked">
+            <Switch disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.issuerUrl')} name="issuer_url" extra={t('settings.oidc.issuerHint')}>
+            <Input placeholder="https://keycloak.example.com/realms/edgeguard" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.clientId')} name="client_id">
+            <Input disabled={isViewer} />
+          </Form.Item>
+          <Form.Item
+            label={t('settings.oidc.clientSecret')}
+            name="client_secret"
+            extra={oidc?.secret_configured ? t('settings.oidc.secretSet') : t('settings.oidc.secretUnset')}
+          >
+            <Input.Password placeholder={oidc?.secret_configured ? '••••••••' : ''} autoComplete="new-password" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.scopes')} name="scopes">
+            <Input placeholder="openid email profile" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.emailClaim')} name="email_claim">
+            <Input placeholder="email" disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.buttonLabel')} name="button_label">
+            <Input disabled={isViewer} />
+          </Form.Item>
+          <Form.Item label={t('settings.oidc.redirectUri')} extra={t('settings.oidc.redirectHint')}>
+            <Typography.Text copyable code style={{ fontSize: 12 }}>{oidc?.redirect_uri || ''}</Typography.Text>
+          </Form.Item>
+          <Form.Item style={{ marginBottom: 0 }}>
+            <Tooltip title={isViewer ? t('auth.viewerBadge') : undefined}>
+              <Button type="primary" htmlType="submit" loading={updateOIDC.isPending} disabled={isViewer}>
+                {t('common.save')}
+              </Button>
+            </Tooltip>
+          </Form.Item>
+        </Form>
+      </Card>
+
       <Card title={<><LockOutlined /> {t('settings.passwordCardTitle')}</>} size="small">
         <Form<ChangePasswordValues>
           form={pwForm}