Add plugin framework and settings UI

packages/db/src/schema/plugins.ts

@@ -0,0 +1,45 @@
+import {
+  pgTable,
+  uuid,
+  text,
+  integer,
+  timestamp,
+  jsonb,
+  index,
+  uniqueIndex,
+} from "drizzle-orm/pg-core";
+import type { PluginCategory, PluginStatus, PaperclipPluginManifestV1 } from "@paperclipai/shared";
+
+/**
+ * `plugins` table — stores one row per installed plugin.
+ *
+ * Each plugin is uniquely identified by `plugin_key` (derived from
+ * the manifest `id`). The full manifest is persisted as JSONB in
+ * `manifest_json` so the host can reconstruct capability and UI
+ * slot information without loading the plugin package.
+ *
+ * @see PLUGIN_SPEC.md §21.3
+ */
+export const plugins = pgTable(
+  "plugins",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    pluginKey: text("plugin_key").notNull(),
+    packageName: text("package_name").notNull(),
+    version: text("version").notNull(),
+    apiVersion: integer("api_version").notNull().default(1),
+    categories: jsonb("categories").$type<PluginCategory[]>().notNull().default([]),
+    manifestJson: jsonb("manifest_json").$type<PaperclipPluginManifestV1>().notNull(),
+    status: text("status").$type<PluginStatus>().notNull().default("installed"),
+    installOrder: integer("install_order"),
+    /** Resolved package path for local-path installs; used to find worker entrypoint. */
+    packagePath: text("package_path"),
+    lastError: text("last_error"),
+    installedAt: timestamp("installed_at", { withTimezone: true }).notNull().defaultNow(),
+    updatedAt: timestamp("updated_at", { withTimezone: true }).notNull().defaultNow(),
+  },
+  (table) => ({
+    pluginKeyIdx: uniqueIndex("plugins_plugin_key_idx").on(table.pluginKey),
+    statusIdx: index("plugins_status_idx").on(table.status),
+  }),
+);