Add instance experimental setting for isolated workspaces

Introduce a singleton instance_settings store and experimental settings API, add the Experimental instance settings page, and gate execution workspace behavior behind the new enableIsolatedWorkspaces flag.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/db/src/migrations/0036_cheerful_nitro.sql

@@ -0,0 +1,9 @@
+CREATE TABLE "instance_settings" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"singleton_key" text DEFAULT 'default' NOT NULL,
+	"experimental" jsonb DEFAULT '{}'::jsonb NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE UNIQUE INDEX "instance_settings_singleton_key_idx" ON "instance_settings" USING btree ("singleton_key");

packages/db/src/migrations/meta/_journal.json

@@ -253,6 +253,13 @@
       "when": 1773698696169,
       "tag": "0035_marvelous_satana",
       "breakpoints": true
+    },
+    {
+      "idx": 36,
+      "version": "7",
+      "when": 1773756213455,
+      "tag": "0036_cheerful_nitro",
+      "breakpoints": true
     }
   ]
-}
+}

packages/db/src/schema/index.ts

@@ -1,6 +1,7 @@
 export { companies } from "./companies.js";
 export { companyLogos } from "./company_logos.js";
 export { authUsers, authSessions, authAccounts, authVerifications } from "./auth.js";
+export { instanceSettings } from "./instance_settings.js";
 export { instanceUserRoles } from "./instance_user_roles.js";
 export { agents } from "./agents.js";
 export { companyMemberships } from "./company_memberships.js";

packages/db/src/schema/instance_settings.ts

@@ -0,0 +1,15 @@
+import { pgTable, uuid, text, timestamp, jsonb, uniqueIndex } from "drizzle-orm/pg-core";
+
+export const instanceSettings = pgTable(
+  "instance_settings",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    singletonKey: text("singleton_key").notNull().default("default"),
+    experimental: jsonb("experimental").$type<Record<string, unknown>>().notNull().default({}),
+    createdAt: timestamp("created_at", { withTimezone: true }).notNull().defaultNow(),
+    updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow(),
+  },
+  (table) => ({
+    singletonKeyIdx: uniqueIndex("instance_settings_singleton_key_idx").on(table.singletonKey),
+  }),
+);