Add personal, Thai address, and emergency contact columns to employees

14 new nullable columns on the employees table:

Personal:
- dateOfBirth, gender, nationality, maritalStatus

Address (Thai-specific):
- addressLine1, addressLine2, subdistrict (Tambon),
  district (Amphoe), province (Changwat), postalCode, country

Emergency contact:
- emergencyContactName, emergencyContactPhone,
  emergencyContactRelationship

All nullable to leave existing rows intact. Constrained sets
(gender, marital status) live in the UI selects rather than
pgEnums for flexibility. Form/UI/export updates follow.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/server/db/schema.ts

@@ -215,6 +215,23 @@ export const employees = pgTable('employees', {
 	taxId: text('tax_id'),
 	bankName: text('bank_name'),
 	bankAccount: text('bank_account'),
+	// Personal
+	dateOfBirth: date('date_of_birth'),
+	gender: text('gender'),
+	nationality: text('nationality'),
+	maritalStatus: text('marital_status'),
+	// Address (Thai-specific)
+	addressLine1: text('address_line_1'),
+	addressLine2: text('address_line_2'),
+	subdistrict: text('subdistrict'),
+	district: text('district'),
+	province: text('province'),
+	postalCode: text('postal_code'),
+	country: text('country'),
+	// Emergency contact
+	emergencyContactName: text('emergency_contact_name'),
+	emergencyContactPhone: text('emergency_contact_phone'),
+	emergencyContactRelationship: text('emergency_contact_relationship'),
 	isActive: boolean('is_active').notNull().default(true),
 	deletedAt: timestamp('deleted_at', { withTimezone: true }),
 	createdAt: timestamp('created_at', { withTimezone: true }).notNull().defaultNow(),