feat: auth middleware, brain data layer, Valkey queue (P1-002/003/004) (#71)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/auth/auth.controller.ts

@@ -0,0 +1,20 @@
+import type { IncomingMessage, ServerResponse } from 'node:http';
+import { All, Controller, Inject, Req, Res } from '@nestjs/common';
+import type { FastifyReply, FastifyRequest } from 'fastify';
+import { toNodeHandler } from 'better-auth/node';
+import type { Auth } from '@mosaic/auth';
+import { AUTH } from './auth.module.js';
+
+@Controller('api/auth')
+export class AuthController {
+  private readonly handler: (req: IncomingMessage, res: ServerResponse) => Promise<void>;
+
+  constructor(@Inject(AUTH) auth: Auth) {
+    this.handler = toNodeHandler(auth);
+  }
+
+  @All('*path')
+  async handleAuth(@Req() req: FastifyRequest, @Res() res: FastifyReply): Promise<void> {
+    await this.handler(req.raw, res.raw);
+  }
+}