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-utils/src/errors.rs

@@ -1,5 +1,10 @@
-use axum::http::StatusCode;
+use axum::{
+    Json,
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
 use serde::Serialize;
+use serde_json::json;
 
 #[derive(Debug, Serialize)]
 pub enum AppError {
@@ -92,4 +97,18 @@ impl From<uuid::Error> for AppError {
     }
 }
 
+impl IntoResponse for AppError {
+    fn into_response(self) -> Response {
+        let status = self.status_code();
+        (
+            status,
+            Json(json!({
+                "message": self.to_string(),
+                "version": env!("CARGO_PKG_VERSION"),
+            })),
+        )
+            .into_response()
+    }
+}
+
 pub type Result<T, E = AppError> = std::result::Result<T, E>;