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/settings/SettingsService.ts

@@ -0,0 +1,83 @@
+import { EntityType, IEventBus } from '../../types/CalendarTypes';
+import {
+  TenantSetting,
+  IWorkweekSettings,
+  IGridSettings,
+  ITimeFormatSettings,
+  IViewSettings,
+  IWorkweekPreset,
+  SettingsIds
+} from '../../types/SettingsTypes';
+import { SettingsStore } from './SettingsStore';
+import { BaseEntityService } from '../BaseEntityService';
+import { IndexedDBContext } from '../IndexedDBContext';
+
+/**
+ * SettingsService - CRUD operations for tenant settings
+ *
+ * Settings are stored as separate records per section.
+ * This service provides typed methods for accessing specific settings.
+ */
+export class SettingsService extends BaseEntityService<TenantSetting> {
+  readonly storeName = SettingsStore.STORE_NAME;
+  readonly entityType: EntityType = 'Settings';
+
+  constructor(context: IndexedDBContext, eventBus: IEventBus) {
+    super(context, eventBus);
+  }
+
+  /**
+   * Get workweek settings
+   */
+  async getWorkweekSettings(): Promise<IWorkweekSettings | null> {
+    return this.get(SettingsIds.WORKWEEK) as Promise<IWorkweekSettings | null>;
+  }
+
+  /**
+   * Get grid settings
+   */
+  async getGridSettings(): Promise<IGridSettings | null> {
+    return this.get(SettingsIds.GRID) as Promise<IGridSettings | null>;
+  }
+
+  /**
+   * Get time format settings
+   */
+  async getTimeFormatSettings(): Promise<ITimeFormatSettings | null> {
+    return this.get(SettingsIds.TIME_FORMAT) as Promise<ITimeFormatSettings | null>;
+  }
+
+  /**
+   * Get view settings
+   */
+  async getViewSettings(): Promise<IViewSettings | null> {
+    return this.get(SettingsIds.VIEWS) as Promise<IViewSettings | null>;
+  }
+
+  /**
+   * Get workweek preset by ID
+   */
+  async getWorkweekPreset(presetId: string): Promise<IWorkweekPreset | null> {
+    const settings = await this.getWorkweekSettings();
+    if (!settings) return null;
+    return settings.presets[presetId] || null;
+  }
+
+  /**
+   * Get the default workweek preset
+   */
+  async getDefaultWorkweekPreset(): Promise<IWorkweekPreset | null> {
+    const settings = await this.getWorkweekSettings();
+    if (!settings) return null;
+    return settings.presets[settings.defaultPreset] || null;
+  }
+
+  /**
+   * Get all available workweek presets
+   */
+  async getWorkweekPresets(): Promise<IWorkweekPreset[]> {
+    const settings = await this.getWorkweekSettings();
+    if (!settings) return [];
+    return Object.values(settings.presets);
+  }
+}