feat: turbostarter boilerplate

Production-ready Next.js boilerplate with:
- Runtime env validation (fail-fast on missing vars)
- Feature-gated config (S3, Stripe, email, OAuth)
- Docker + Coolify deployment pipeline
- PostgreSQL + pgvector, MinIO S3, Better Auth
- TypeScript strict mode (no ignoreBuildErrors)
- i18n (en/es), AI modules, billing, monitoring

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/public/pdfjs-images/annotation-insert.svg

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns="http://www.w3.org/2000/svg"
+   width="64"
+   height="64"
+   viewBox="0 0 64 64">
+  <path
+     d="M 32.003143,1.4044602 57.432701,62.632577 6.5672991,62.627924 z"
+     style="fill:#ffff00;fill-opacity:0.94117647;fill-rule:nonzero;stroke:#000000;stroke-width:1.00493038;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
+</svg>