Add employees management module with database schema and validation

- Introduced `EmployeesModule` to manage employee data, including read and write controllers.
- Created database migrations for the `employees` table, including constraints and unique indexes.
- Implemented validation for employee fields such as name, code, and position with corresponding utility functions.
- Developed service and repository layers for handling employee data operations.
- Added unit tests for the employees service, repository, and controllers to ensure functionality and correctness.
- Updated application module to include the new `EmployeesModule` for better organization.

drizzle/migrations/0007_employees.sql

@@ -0,0 +1,19 @@
+CREATE TABLE "employees" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"code" varchar(16) NOT NULL,
+	"name" varchar(64) NOT NULL,
+	"phone" text NOT NULL,
+	"position" text NOT NULL,
+	"status" text DEFAULT 'draft' NOT NULL,
+	"created_at" bigint NOT NULL,
+	"updated_at" bigint NOT NULL,
+	"created_by" uuid NOT NULL,
+	"updated_by" uuid NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "employees" ADD CONSTRAINT "employees_created_by_users_id_fk" FOREIGN KEY ("created_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "employees" ADD CONSTRAINT "employees_updated_by_users_id_fk" FOREIGN KEY ("updated_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "employees_code_unique" ON "employees" USING btree ("code");
+--> statement-breakpoint
+INSERT INTO "privilege_keys" ("code", "label", "sort_order") VALUES
+	('CONFIGURATION.EMPLOYEE', 'Employees', 6);