feat(activity): per-tenant audit feed in notification dropdown

activity_events records booking lifecycle transitions with the actor
behind each change — staff (dashboard), customer (self-service), or
system (auto-promotion). The notification dropdown leads with the real
feed instead of derived recent-booking guesses.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

packages/api-client/src/generated/types.ts

@@ -15,6 +15,26 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/v1/activity": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        /**
+         * Recent tenant activity feed
+         * @description Audit feed of booking lifecycle events — created, cancelled, rescheduled, moved, promoted — with the actor (staff member, customer, or system) for each change. Newest first.
+         */
+        get: operations["listActivityEvents"];
+        put?: never;
+        post?: never;
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/v1/admin/stats": {
         parameters: {
             query?: never;
@@ -1060,6 +1080,28 @@ export interface paths {
 export type webhooks = Record<string, never>;
 export interface components {
     schemas: {
+        ActivityEvent: {
+            /** @description Dotted verb, e.g. booking.created, booking.cancelled, booking.promoted */
+            action: string;
+            /**
+             * @description Who performed the change — dashboard user, self-service customer, or an automatic transition
+             * @enum {string}
+             */
+            actorKind: "staff" | "customer" | "system";
+            actorName?: string;
+            /** Format: date-time */
+            createdAt: string;
+            /** Format: uuid */
+            entityId?: string;
+            entityType: string;
+            /** Format: uuid */
+            id: string;
+            /** @description Human-readable label, e.g. "Alice Johnson — Relaxation massage" */
+            summary: string;
+        };
+        ActivityFeedResponse: {
+            events: components["schemas"]["ActivityEvent"][];
+        };
         AuthResponse: {
             accessToken: string;
             expiresIn?: number;
@@ -1679,6 +1721,35 @@ export interface operations {
             };
         };
     };
+    listActivityEvents: {
+        parameters: {
+            query?: {
+                limit?: number;
+            };
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Activity events, newest first */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": components["schemas"]["ActivityFeedResponse"];
+                };
+            };
+            /** @description Tenant membership not found */
+            404: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content?: never;
+            };
+        };
+    };
     getAdminStats: {
         parameters: {
             query?: never;