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/shared/src/utils/common.ts

@@ -0,0 +1,19 @@
+export { default as capitalize } from "lodash/capitalize";
+export { default as debounce } from "lodash/debounce";
+export { default as groupBy } from "lodash/groupBy";
+export { default as mapValues } from "lodash/mapValues";
+export { default as merge } from "lodash/merge";
+export { default as omitBy } from "lodash/omitBy";
+export { default as pickBy } from "lodash/pickBy";
+export { default as random } from "lodash/random";
+export { default as sortBy } from "lodash/sortBy";
+export { default as transform } from "lodash/transform";
+export { default as slugify } from "slugify";
+
+export function splitArray<T>(array: T[], chunkSize: number): T[][] {
+  const result: T[][] = [];
+  for (let i = 0; i < array.length; i += chunkSize) {
+    result.push(array.slice(i, i + chunkSize));
+  }
+  return result;
+}