chore(db): add query indexes migration and update project config

- Add database migration for missing query indexes on frequently filtered columns
- Update Prisma schema
- Update .env.example, eslint config, and dependency-cruiser config

Co-Authored-By: Paperclip <noreply@paperclip.ing>

eslint.config.mjs

@@ -88,6 +88,32 @@ export default tseslint.config(
     },
   },
 
+  // Module encapsulation: prevent cross-module internal imports
+  // (excludes test files — tests may import internals directly for unit testing)
+  {
+    files: ['apps/api/src/modules/**/*.ts'],
+    ignores: ['**/*.spec.ts', '**/*.test.ts', '**/__tests__/**'],
+    rules: {
+      'no-restricted-imports': [
+        'error',
+        {
+          patterns: [
+            {
+              group: [
+                '@modules/*/application/*',
+                '@modules/*/domain/*',
+                '@modules/*/infrastructure/*',
+                '@modules/*/presentation/*',
+              ],
+              message:
+                'Import from the module barrel (@modules/<module>) instead of internal paths. This preserves module encapsulation.',
+            },
+          ],
+        },
+      ],
+    },
+  },
+
   // React/Next.js overrides for web app
   {
     files: ['apps/web/**/*.ts', 'apps/web/**/*.tsx'],