feat: Phase 1 — Authentik auth, MCP endpoint, persistent memory

End-to-end Phase 1 of shared-memory: a logged-in Authentik user can sign
into the Web UI (/me debug page), and an MCP client with an Authentik-
issued bearer token can call memory.write / memory.list / memory.get /
memory.delete plus project.identify against /api/mcp.

Stack:
- Next.js 15 (App Router) + React 19 + TypeScript, pnpm workspaces
- Drizzle ORM + Postgres 16 + pgvector + pg_trgm
- Auth.js v5 with Authentik provider (Web UI)
- jose + Authentik JWKS for MCP bearer-token validation
- JSON-RPC 2.0 dispatcher implementing the MCP wire protocol over plain
  HTTP POST (hand-rolled to fit Next.js App Router; switches to SSE in a
  later phase if server-initiated events are needed)
- bge-small embeddings sidecar deferred to Phase 2; the schema already
  reserves the vector(384) column + IVFFlat index, FTS via a STORED
  tsvector column, and the visibility enum (private/shared/team) so
  cross-user memory sharing can be added without a future migration

Deployment supports two modes (set in .env, never committed):
- Behind an external reverse proxy (HAProxy / nginx / Cloudflare Tunnel /
  Traefik) — DEFAULT; the app exposes APP_PORT on the host with
  X-Forwarded-* trusted, no in-container TLS
- Built-in TLS via Caddy — opt-in with `docker compose --profile tls up`

Discovery endpoint at /.well-known/oauth-protected-resource (RFC 9728)
points MCP clients at the Authentik authorization server after a 401.

README walks through both Authentik providers (Web UI + MCP resource
server), the audience scope mapping, redirect URIs, and includes a worked
HAProxy config snippet.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/.well-known/oauth-protected-resource/route.ts

@@ -0,0 +1,22 @@
+import { NextResponse } from "next/server";
+import { env } from "@/lib/env";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+/**
+ * RFC 9728 — OAuth 2.0 Protected Resource Metadata.
+ *
+ * MCP clients discover the authorization server (Authentik) via this
+ * endpoint after receiving a 401 with `WWW-Authenticate: resource_metadata=...`.
+ */
+export function GET() {
+  const resource = env().PUBLIC_URL.replace(/\/$/, "");
+  return NextResponse.json({
+    resource,
+    authorization_servers: [env().OIDC_ISSUER],
+    scopes_supported: ["openid", "profile", "email"],
+    bearer_methods_supported: ["header"],
+    resource_documentation: `${resource}/`,
+  });
+}