feat(communication): add room visibility and project chat controls

backend/db/schema/communication_hidden_rooms.ts

@@ -0,0 +1,10 @@
+import { bigint, pgTable, primaryKey, text, uuid } from "drizzle-orm/pg-core"
+import { authUsers } from "./auth_users"
+import { tenants } from "./tenants"
+
+// Room keys also cover collaboration bindings and not-yet-provisioned chats.
+export const communicationHiddenRooms = pgTable("communication_hidden_rooms", {
+    tenantId: bigint("tenant_id", { mode: "number" }).notNull().references(() => tenants.id, { onDelete: "cascade" }),
+    userId: uuid("user_id").notNull().references(() => authUsers.id, { onDelete: "cascade" }),
+    roomKey: text("room_key").notNull(),
+}, table => ({ pk: primaryKey({ columns: [table.tenantId, table.userId, table.roomKey] }) }))