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>

flake.nix

@@ -5,28 +5,37 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
   };
 
-  outputs = {
-    self,
-    nixpkgs,
-  }: let
-    supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux"];
-    pkgsFor = system:
-      import nixpkgs {
-        inherit system;
-        config = {
-          allowUnfree = true;
+  outputs =
+    {
+      self,
+      nixpkgs,
+    }:
+    let
+      supportedSystems = [
+        "x86_64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+        "aarch64-linux"
+      ];
+      pkgsFor =
+        system:
+        import nixpkgs {
+          inherit system;
+          config = {
+            allowUnfree = true;
+          };
         };
-      };
-    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-  in {
-    packages = forAllSystems (system: {
-      default = (pkgsFor system).callPackage ./default.nix {};
-    });
-    devShells = forAllSystems (system: {
-      default = (pkgsFor system).callPackage ./shell.nix {};
-    });
-    dockerImages = forAllSystems (system: {
-      tryOutApi = (pkgsFor system).callPackage ./docker.nix {};
-    });
-  };
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    in
+    {
+      packages = forAllSystems (system: {
+        default = (pkgsFor system).callPackage ./default.nix { };
+      });
+      devShells = forAllSystems (system: {
+        default = (pkgsFor system).callPackage ./shell.nix { };
+      });
+      dockerImages = forAllSystems (system: {
+        tryOutApi = (pkgsFor system).callPackage ./docker.nix { };
+      });
+    };
 }