chore: guard backend responsibility boundaries

eslint.config.mjs

@@ -15,6 +15,9 @@ import globals from 'globals';
 import tseslint from 'typescript-eslint';
 
 const tests = ['**/*.spec.ts', 'test/**/*.ts'];
+const prismaImports = [
+  '@prisma/*', '**/generated/prisma/**', '**/prisma.service',
+];
 
 export default defineConfig(
   globalIgnores(['dist/**', 'dist-dev/**', 'build/**', 'generated/**', 'coverage/**', 'node_modules/**']),
@@ -119,6 +122,52 @@ export default defineConfig(
       'jest/expect-expect': ['error', { assertFunctionNames: ['expect', '**.expect'] }],
     },
   },
+  {
+    files: ['src/modules/**/domain/**/*.ts'],
+    ignores: tests,
+    rules: {
+      'no-restricted-imports': ['error', {
+        patterns: [{
+          group: [
+            '@nestjs/*', ...prismaImports, '**/*.dto', '**/*.repository',
+            '**/*.client', '**/application/**', '**/infrastructure/**',
+          ],
+          message: 'Domain uses pure rules and value types, not transport or persistence.',
+        }],
+      }],
+    },
+  },
+  {
+    files: ['src/**/*.controller.ts'],
+    ignores: tests,
+    rules: {
+      'no-restricted-imports': ['error', {
+        patterns: [
+          {
+            group: [...prismaImports, '**/*.repository', '**/*.client'],
+            message: 'Controllers delegate to application services or use cases.',
+          },
+          {
+            group: ['**'],
+            importNamePattern: '(?:Client|Repository|PrismaService)$',
+            message: 'Use application orchestration rather than data providers in controllers.',
+          },
+        ],
+      }],
+    },
+  },
+  {
+    files: ['src/**/*.use-case.ts'],
+    ignores: tests,
+    rules: {
+      'no-restricted-imports': ['error', {
+        patterns: [{
+          group: prismaImports,
+          message: 'Use cases obtain data through concrete repositories.',
+        }],
+      }],
+    },
+  },
   {
     files: [
       'src/**/*.ts',