feat(broker): branded react-email template for mesh invite

Replaces the plain-text invite email with a standalone react-email
template (apps/broker/src/emails/mesh-invitation.tsx) using
@react-email/components + Tailwind. Rendered on demand in
handleCliMeshInvite and sent as both HtmlBody and TextBody via
Postmark (or html+text via Resend).

Self-contained — no dependency on @turbostarter/email, i18n, or ui
packages. Adds react, react-dom, @react-email/components, @react-email/render
to broker deps. Enables tsconfig jsx: react-jsx and .tsx includes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/broker/package.json

@@ -17,6 +17,8 @@
   "dependencies": {
     "@anthropic-ai/sdk": "0.71.2",
     "@qdrant/js-client-rest": "1.17.0",
+    "@react-email/components": "0.3.2",
+    "@react-email/render": "1.3.2",
     "@turbostarter/db": "workspace:*",
     "@turbostarter/shared": "workspace:*",
     "drizzle-orm": "0.44.7",
@@ -24,6 +26,8 @@
     "libsodium-wrappers": "0.7.15",
     "minio": "8.0.7",
     "neo4j-driver": "6.0.1",
+    "react": "19.2.0",
+    "react-dom": "19.2.0",
     "ws": "8.20.0",
     "zod": "catalog:"
   },
@@ -33,6 +37,8 @@
     "@turbostarter/tsconfig": "workspace:*",
     "@turbostarter/vitest-config": "workspace:*",
     "@types/libsodium-wrappers": "0.7.14",
+    "@types/react": "19.2.0",
+    "@types/react-dom": "19.2.0",
     "@types/ws": "8.5.13",
     "eslint": "catalog:",
     "prettier": "catalog:",