feat(auth): интегрировать SSO auth-portal

JWT на backend, handoff/callback на UI, RBAC mm:*, AUTH_* в compose.

Co-authored-by: Cursor <[email protected]>

app/auth/callback/page.tsx

@@ -0,0 +1,98 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { useRouter } from "next/navigation"
+import {
+  clearPortalHandoffFlag,
+  clearToken,
+  ensureAuthConfig,
+  firstAllowedPath,
+  getClaims,
+  getToken,
+  parseHashToken,
+  redirectToPortalLogin,
+  redirectToPortalLoginInteractive,
+  setToken,
+} from "@/lib/auth"
+
+export default function AuthCallbackPage() {
+  const router = useRouter()
+  const [message, setMessage] = useState("Перенаправление на Auth Portal…")
+
+  useEffect(() => {
+    let cancelled = false
+
+    void (async () => {
+      await ensureAuthConfig()
+      if (cancelled) return
+
+      const params = new URLSearchParams(window.location.search)
+      const error = params.get("error")
+      if (error === "sso_loop" || error === "jwt_rejected") {
+        redirectToPortalLoginInteractive()
+        return
+      }
+
+      const { accessToken } = parseHashToken(window.location.hash)
+      if (accessToken) {
+        setToken(accessToken)
+        clearPortalHandoffFlag()
+        const claims = getClaims()
+        if (!claims) {
+          clearToken()
+          redirectToPortalLoginInteractive()
+          return
+        }
+        if (!claims.apps.includes("mm")) {
+          setMessage("Нет доступа к приложению")
+          router.replace("/access-denied")
+          return
+        }
+
+        try {
+          const res = await fetch("/api/auth/config", {
+            headers: { Authorization: `Bearer ${accessToken}` },
+          })
+          if (res.status === 401) {
+            clearToken()
+            redirectToPortalLoginInteractive()
+            return
+          }
+        } catch {
+          /* ignore network — proceed */
+        }
+
+        const next = firstAllowedPath()
+        if (next === "/access-denied") {
+          router.replace("/access-denied")
+          return
+        }
+        router.replace(next)
+        return
+      }
+
+      if (getToken() && getClaims()) {
+        clearPortalHandoffFlag()
+        if (!getClaims()!.apps.includes("mm")) {
+          router.replace("/access-denied")
+          return
+        }
+        router.replace(firstAllowedPath())
+        return
+      }
+
+      const ok = redirectToPortalLogin(`${window.location.origin}/auth/callback`)
+      if (!ok) redirectToPortalLoginInteractive()
+    })()
+
+    return () => {
+      cancelled = true
+    }
+  }, [router])
+
+  return (
+    <div className="text-muted-foreground flex min-h-svh items-center justify-center p-6 text-sm">
+      {message}
+    </div>
+  )
+}