75e685d418
Reorganize the data layer by separating DTOs (Data Transfer Objects) from Zod validation schemas into distinct directory structures. Previously, all model types were imported from a single `@/data/models` barrel file, mixing request/response classes with validation schemas. Changes: - Update API files (auth, chat, metrics, user) to import DTOs from specific paths under `@/data/dto/*` instead of the models barrel - Move user schema to `@/data/schemas/user/user` for type-only imports - Create dedicated Zod schema files under `@/data/schemas/*` for auth and chat domain models (e.g., AppleLoginRequestSchema, SendMessageRequestSchema, SyncMessageSchema, SttDataSchema) - Improve discoverability and tree-shaking by co-locating schemas with their respective domain areas This is a non-functional refactor that lays the groundwork for clearer separation between transport-layer types and runtime validation.