refactor: migrate to clean architecture with trait-based DI (v0.2.0)

Complete architectural overhaul across all 12 crates:

- Replace validator crate with zod-rs for all DTO validation
- Replace manual pagination with paginator-rs/paginator-sea-orm
- Migrate all modules (iam, cms, gacha, dimentorin) to clean architecture:
  domain → application → infrastructure layers
- Introduce trait-based DI (Arc<dyn Trait>) at every layer for repositories and services
- Delete all v1/ legacy SurrealDB-era code across every crate
- Replace opaque response helpers with typed IntoResponse structs (ApiSuccess, ApiCreated, ApiPaginated, ApiMessage)
- Remove dual_mode_repository, migration_validation_errors, validator.rs dead code
- Zero cargo clippy warnings; release build clean

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

imphnen-backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "imphnen-backend"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
 [[bin]]
@@ -63,7 +63,6 @@ serde_json.workspace = true
 utoipa.workspace = true
 lazy_static.workspace = true
 regex.workspace = true
-validator.workspace = true
 axum-test.workspace = true
 rand.workspace = true
 tokio.workspace = true