Sets up calendar package with core infrastructure

Adds core calendar package components including:
- Base services for events, resources, and settings
- Calendar app and orchestrator
- Build and bundling configuration
- IndexedDB storage setup

Prepares foundational architecture for calendar functionality

packages/calendar/src/storage/events/EventStore.ts

@@ -0,0 +1,37 @@
+import { IStore } from '../IStore';
+
+/**
+ * EventStore - IndexedDB ObjectStore definition for calendar events
+ */
+export class EventStore implements IStore {
+  static readonly STORE_NAME = 'events';
+  readonly storeName = EventStore.STORE_NAME;
+
+  /**
+   * Create the events ObjectStore with indexes
+   */
+  create(db: IDBDatabase): void {
+    const store = db.createObjectStore(EventStore.STORE_NAME, { keyPath: 'id' });
+
+    // Index: start (for date range queries)
+    store.createIndex('start', 'start', { unique: false });
+
+    // Index: end (for date range queries)
+    store.createIndex('end', 'end', { unique: false });
+
+    // Index: syncStatus (for filtering by sync state)
+    store.createIndex('syncStatus', 'syncStatus', { unique: false });
+
+    // Index: resourceId (for resource-mode filtering)
+    store.createIndex('resourceId', 'resourceId', { unique: false });
+
+    // Index: customerId (for customer-centric queries)
+    store.createIndex('customerId', 'customerId', { unique: false });
+
+    // Index: bookingId (for event-to-booking lookups)
+    store.createIndex('bookingId', 'bookingId', { unique: false });
+
+    // Compound index: startEnd (for optimized range queries)
+    store.createIndex('startEnd', ['start', 'end'], { unique: false });
+  }
+}