front(lint): ESLint 9 flat config + angular-eslint 19

- eslint.config.js (flat) : recommended TS + angular-eslint (ts + templates
  a11y), règles selectors app + no-unused-vars (^_ ignoré)
- script lint -> 'eslint .' (+ lint:fix), évite la résolution du builder
  Angular sous pnpm
- fix de la seule violation (variable _ inutilisée dans l'effect catalog)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

front-public/eslint.config.js

@@ -0,0 +1,38 @@
+// @ts-check
+const eslint = require('@eslint/js');
+const tseslint = require('typescript-eslint');
+const angular = require('angular-eslint');
+
+module.exports = tseslint.config(
+  {
+    ignores: ['dist/**', 'node_modules/**', '.angular/**', 'coverage/**'],
+  },
+  {
+    files: ['**/*.ts'],
+    extends: [
+      eslint.configs.recommended,
+      ...tseslint.configs.recommended,
+      ...angular.configs.tsRecommended,
+    ],
+    processor: angular.processInlineTemplates,
+    rules: {
+      '@angular-eslint/directive-selector': [
+        'error',
+        { type: 'attribute', prefix: 'app', style: 'camelCase' },
+      ],
+      '@angular-eslint/component-selector': [
+        'error',
+        { type: 'element', prefix: 'app', style: 'kebab-case' },
+      ],
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+    },
+  },
+  {
+    files: ['**/*.html'],
+    extends: [
+      ...angular.configs.templateRecommended,
+      ...angular.configs.templateAccessibility,
+    ],
+    rules: {},
+  },
+);