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/lib/db/client.ts

@@ -0,0 +1,25 @@
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import { env } from "@/lib/env";
+import * as schema from "./schema";
+
+// Reuse a single connection pool across hot reloads in dev.
+type GlobalWithPg = typeof globalThis & {
+  __sharedMemoryPg?: ReturnType<typeof postgres>;
+};
+const g = globalThis as GlobalWithPg;
+
+function makePool() {
+  return postgres(env().DATABASE_URL, {
+    max: 10,
+    idle_timeout: 30,
+    connect_timeout: 10,
+    prepare: false,
+  });
+}
+
+const sql = g.__sharedMemoryPg ?? makePool();
+if (process.env.NODE_ENV !== "production") g.__sharedMemoryPg = sql;
+
+export const db = drizzle(sql, { schema, logger: env().LOG_LEVEL === "debug" });
+export { sql as pg, schema };