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/db/src/schema/index.ts

@@ -0,0 +1,46 @@
+import * as auth from "./auth";
+import * as chat from "./chat";
+import * as creditTransactions from "./credit-transaction";
+import * as customers from "./customer";
+import * as image from "./image";
+import * as mesh from "./mesh";
+import * as pdf from "./pdf";
+
+type Prefix<
+  T extends Record<string, unknown>,
+  K extends keyof T,
+  P extends string,
+> = {
+  [Key in K as `${P}.${Key & string}`]: T[Key];
+};
+
+export const prefix = <T extends Record<string, unknown>, P extends string>(
+  obj: T,
+  prefix: P,
+) => {
+  return Object.entries(obj).reduce(
+    (acc, [key, value]) => ({ ...acc, [`${prefix}.${key}`]: value }),
+    {} as Prefix<T, keyof T, P>,
+  );
+};
+
+export const schema = {
+  ...auth,
+  ...creditTransactions,
+  ...customers,
+  ...prefix(chat, "chat"),
+  ...prefix(pdf, "pdf"),
+  ...prefix(image, "image"),
+  ...prefix(mesh, "mesh"),
+};
+
+// Direct exports for backward compatibility
+export * from "./auth";
+export * from "./credit-transaction";
+export * from "./customer";
+
+// pgSchema-based modules (need explicit exports for drizzle-kit)
+export * from "./chat";
+export * from "./pdf";
+export * from "./image";
+export * from "./mesh";