refactor : merge Inventory_frontend submodule into frontend/ directory

Merges the full git history of Inventory_frontend into the monorepo
under frontend/. Removes the submodule in favor of a unified repo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/eslint.config.mjs

@@ -0,0 +1,83 @@
+import nuxt from '@nuxt/eslint-config';
+
+const globals = {
+  defineNuxtConfig: 'readonly',
+  defineNuxtRouteMiddleware: 'readonly',
+  navigateTo: 'readonly',
+  useRuntimeConfig: 'readonly',
+  $fetch: 'readonly',
+};
+
+const relaxedRules = {
+  // Vue rules — relaxed for legacy code
+  'vue/no-parsing-error': 'off',
+  'vue/no-required-prop-with-default': 'off',
+  'vue/no-mutating-props': 'off',
+  'vue/html-self-closing': 'off',
+  'vue/singleline-html-element-content-newline': 'off',
+  'vue/multiline-html-element-content-newline': 'off',
+  'vue/html-indent': 'off',
+  'vue/attributes-order': 'off',
+  'vue/multi-word-component-names': 'off',
+  'vue/no-multiple-template-root': 'off',
+  'vue/v-on-event-hyphenation': 'off',
+  'vue/require-default-prop': 'off',
+
+  // Console — allow console.error only
+  'no-console': ['warn', { allow: ['error'] }],
+
+  // Unused vars — warn, ignore underscore-prefixed
+  'no-unused-vars': 'off',
+  '@typescript-eslint/no-unused-vars': ['warn', {
+    argsIgnorePattern: '^_',
+    varsIgnorePattern: '^_',
+    caughtErrorsIgnorePattern: '^_',
+  }],
+
+  // TypeScript — progressive strictness
+  '@typescript-eslint/no-explicit-any': 'warn',
+  '@typescript-eslint/no-dynamic-delete': 'off',
+  '@typescript-eslint/no-invalid-void-type': 'off',
+  '@typescript-eslint/unified-signatures': 'off',
+
+  // Formatting — handled by Prettier/stylistic
+  'require-await': 'off',
+  'comma-dangle': 'off',
+  curly: 'off',
+  'operator-linebreak': 'off',
+  'space-before-function-paren': 'off',
+  'arrow-parens': 'off',
+  semi: 'off',
+  '@typescript-eslint/semi': 'off',
+  quotes: 'off',
+  'func-call-spacing': 'off',
+  'no-trailing-spaces': 'off',
+  indent: 'off',
+  'no-multiple-empty-lines': 'off',
+  'import/order': 'off',
+  'no-irregular-whitespace': 'off',
+  'no-useless-escape': 'off',
+  'nuxt/prefer-import-meta': 'off',
+};
+
+export default await nuxt(
+  {
+    features: {
+      stylistic: false,
+      typescript: true,
+      nuxt: {
+        sortConfigKeys: false,
+      },
+    },
+    dirs: {
+      root: ['.', './app'],
+    },
+  },
+  {
+    name: 'project/custom-overrides',
+    languageOptions: {
+      globals,
+    },
+    rules: relaxedRules,
+  }
+);