feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

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

packages/email/src/utils/env.ts

@@ -0,0 +1,19 @@
+import { defineEnv } from "envin";
+import * as z from "zod";
+
+import { envConfig } from "@turbostarter/shared/constants";
+
+import type { Preset } from "envin/types";
+
+export const sharedPreset = {
+  id: "shared",
+  server: {
+    EMAIL_FROM: z.string().optional().default("noreply@example.com"),
+    // Default kept intentionally — runtime validation warns if not overridden
+  },
+} as const satisfies Preset;
+
+export const sharedEnv = defineEnv({
+  ...envConfig,
+  ...sharedPreset,
+});