feat(09-01): add property_address column to clients — schema, migration, server actions

- Add propertyAddress: text("property_address") nullable column to clients pgTable
- Generate migration drizzle/0007_equal_nekra.sql: ALTER TABLE "clients" ADD COLUMN "property_address" text
- Apply migration successfully to local postgres database
- Extend clientSchema Zod schema with propertyAddress: z.string().optional()
- createClient: persist propertyAddress || null to coerce empty string to NULL
- updateClient: persist propertyAddress || null alongside name, email, updatedAt

teressa-copeland-homes/drizzle/0007_equal_nekra.sql

@@ -0,0 +1 @@
+ALTER TABLE "clients" ADD COLUMN "property_address" text;