Add field management module with database schema and validation

- Introduced `FieldModule` to manage cycles and plans, including read and write controllers.
- Created database migrations for `company_settings`, `cycles`, `cycle_weekdays`, `cycle_destinations`, `plans`, `plan_destinations`, `plan_invoices`, and `plan_packing_slips` tables, including constraints and unique indexes.
- Developed service and repository layers for handling cycle and plan data operations.
- Added unit tests for the cycles and plans services, repositories, and controllers to ensure functionality and correctness.
- Updated application module to include the new `FieldModule` for better organization.

src/database/company-settings-table.ts

@@ -0,0 +1,15 @@
+import { bigint, pgTable, uuid } from 'drizzle-orm/pg-core';
+import { primaryEntityColumns } from './primary-entity-columns';
+import { users } from './schema';
+
+/**
+ * Company-wide operational settings (singleton aggregate).
+ */
+export const companySettings = pgTable('company_settings', {
+  id: uuid('id').defaultRandom().notNull().primaryKey(),
+  cycleStartDate: bigint('cycle_start_date', { mode: 'number' }).notNull(),
+  ...primaryEntityColumns(users),
+});
+
+export type CompanySettingsRow = typeof companySettings.$inferSelect;
+export type NewCompanySettingsRow = typeof companySettings.$inferInsert;