대규모 백엔드 리팩토링 진행

CLAUDE.md

@@ -320,3 +320,50 @@ Shared libraries:
 - You should always write your code in a way that makes it easy to unit test.
 - Comments shouldn't be used unless absolutely necessary. Write readable code that can be understood without comments, and only include comments for unavoidable business logic.
 - Variable values should be separated into constants whenever possible. Avoid creating magic numbers.
+
+### NestJS GraphQL Resolver Method Ordering
+
+In NestJS GraphQL resolvers, organize methods by decorator type (not alphabetically across all methods). Within each decorator group, sort methods alphabetically.
+
+**Order**:
+
+1. `constructor`
+2. `@Query` methods (alphabetically)
+3. `@Mutation` methods (alphabetically)
+4. `@ResolveField` methods (alphabetically)
+
+**Rationale**: GraphQL queries, mutations, and field resolvers are fundamentally different operations. Grouping by decorator type maintains logical cohesion while the decorator itself provides visual separation (no comments needed).
+
+**Example**:
+
+```typescript
+@Resolver(() => Content)
+export class ContentResolver {
+  constructor(private contentService: ContentService) {}
+
+  @Query(() => Content)
+  async content(@Args("id") id: number) {
+    return await this.contentService.findContentById(id);
+  }
+
+  @Query(() => [Content])
+  async contentList(@Args("filter") filter?: ContentListFilter) {
+    return await this.contentService.findContentList(filter);
+  }
+
+  @Mutation(() => ContentCreateResult)
+  async contentCreate(@Args("input") input: ContentCreateInput) {
+    return await this.contentService.createContent(input);
+  }
+
+  @ResolveField(() => ContentCategory)
+  async contentCategory(@Parent() content: Content) {
+    return await this.dataLoaderService.contentCategory.findById(content.contentCategoryId);
+  }
+
+  @ResolveField(() => String)
+  async displayName(@Parent() content: Content) {
+    return `${content.name}${content.gate ? ` ${content.gate}관문` : ""}`;
+  }
+}
+```

src/backend/eslint.config.js

@@ -7,7 +7,7 @@ export default [
   ...tseslint.configs.recommended,
   {
     files: ["src/**/*.ts", "test/**/*.ts"],
-    ignores: ["dist", "node_modules"],
+    ignores: ["dist", "node_modules", "**/*.resolver.ts"],
     languageOptions: {
       parser: tseslint.parser,
       parserOptions: {
@@ -66,4 +66,91 @@ export default [
       ],
     },
   },
+  {
+    files: ["**/*.resolver.ts"],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: "latest",
+        project: "./tsconfig.json",
+        sourceType: "module",
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    plugins: {
+      "@typescript-eslint": tseslint.plugin,
+      perfectionist,
+    },
+    rules: {
+      "@typescript-eslint/consistent-type-definitions": ["error", "type"],
+      "@typescript-eslint/explicit-function-return-type": "off",
+      "@typescript-eslint/explicit-module-boundary-types": "off",
+      "@typescript-eslint/interface-name-prefix": "off",
+      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          argsIgnorePattern: "^_",
+          caughtErrorsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+        },
+      ],
+      "perfectionist/sort-classes": [
+        "error",
+        {
+          type: "alphabetical",
+          order: "asc",
+          groups: [
+            "constructor",
+            "decorated-query-method",
+            "decorated-mutation-method",
+            "decorated-resolve-field-method",
+            "unknown",
+          ],
+          customGroups: [
+            {
+              groupName: "decorated-query-method",
+              selector: "method",
+              modifiers: ["decorated"],
+              decoratorNamePattern: "Query",
+            },
+            {
+              groupName: "decorated-mutation-method",
+              selector: "method",
+              modifiers: ["decorated"],
+              decoratorNamePattern: "Mutation",
+            },
+            {
+              groupName: "decorated-resolve-field-method",
+              selector: "method",
+              modifiers: ["decorated"],
+              decoratorNamePattern: "ResolveField",
+            },
+          ],
+        },
+      ],
+      "perfectionist/sort-interfaces": [
+        "error",
+        {
+          order: "asc",
+          type: "alphabetical",
+        },
+      ],
+      "perfectionist/sort-object-types": [
+        "error",
+        {
+          order: "asc",
+          type: "alphabetical",
+        },
+      ],
+      "perfectionist/sort-objects": [
+        "error",
+        {
+          order: "asc",
+          partitionByComment: true,
+          type: "alphabetical",
+        },
+      ],
+    },
+  },
 ];

src/backend/package.json

@@ -34,12 +34,14 @@
     "@prisma/client": "5.22.0",
     "@quixo3/prisma-session-store": "3.1.13",
     "apollo-server-express": "3.13.0",
+    "class-transformer": "0.5.1",
+    "class-validator": "0.14.2",
     "dataloader": "2.2.3",
     "dayjs": "1.11.13",
     "discord-webhook-node": "1.1.8",
+    "es-toolkit": "1.42.0",
     "express-session": "1.18.1",
     "graphql": "16.9.0",
-    "lodash": "4.17.21",
     "nestjs-cls": "6.1.0",
     "passport": "0.7.0",
     "passport-discord": "0.1.4",
@@ -59,7 +61,6 @@
     "@types/express": "5.0.0",
     "@types/express-session": "1.18.1",
     "@types/jest": "29.5.2",
-    "@types/lodash": "4.17.13",
     "@types/node": "20.3.1",
     "@types/passport": "1.0.17",
     "@types/passport-discord": "0.1.14",