feat: initial scaffold - backend, frontend, Prisma schema, Docker

- Prisma schema: User, Session, RepoConfig, Preview, Job, WebhookToken, NoConfigComment, AdminSettings
- Backend: auth (login/logout/me/first-user setup), webhook handler with HMAC verification, EC2 service, SSH service, deploy pipeline, job queue worker, cron workers
- Frontend: Login with first-user detection, Dashboard, PreviewDetail with live log streaming, Settings, Repos config, Admin panel, SetupWizard, Privacy page
- Docker Compose and Dockerfile for self-hosted deployment
- Uses bcryptjs for Node 24 compatibility

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/lib/logger.ts

@@ -0,0 +1,14 @@
+import { env } from "./env";
+import pino from "pino";
+
+export const logger = pino({
+  level: env.LOG_LEVEL,
+  transport:
+    env.NODE_ENV !== "production"
+      ? { target: "pino-pretty", options: { colorize: true } }
+      : undefined,
+});
+
+export function createLogger(component: string) {
+  return logger.child({ component });
+}