ci: Add comprehensive CI quality gates

- New ci.yml workflow: rust-format, clippy, rust-test, security-audit, frontend-lint
- rustfmt.toml: strict formatting rules (edition 2021, max_width 100, grouped imports)
- clippy.toml: lint configuration with complexity thresholds
- eslint.config.js: ESLint 9 flat config for TypeScript/React
- build.yml: now only triggers on v* tags (ci.yml handles master/PR)
- package.json: updated lint script for ESLint 9 flat config

Quality gates run on every push to master and every PR:
1. Rust Format Check (cargo fmt --check --all)
2. Clippy Lints (pedantic + deny warnings)
3. Rust Unit Tests (cargo test --workspace --all-features)
4. Security Audit (cargo audit)
5. Frontend Lint (ESLint + TypeScript type check)

frontend/eslint.config.js

@@ -0,0 +1,59 @@
+import js from '@eslint/js';
+import tseslint from '@typescript-eslint/eslint-plugin';
+import tsparser from '@typescript-eslint/parser';
+
+export default [
+  {
+    files: ['src/**/*.{ts,tsx}'],
+    languageOptions: {
+      parser: tsparser,
+      parserOptions: {
+        ecmaVersion: 'latest',
+        sourceType: 'module',
+        ecmaFeatures: { jsx: true },
+        project: './tsconfig.json',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tseslint,
+    },
+    rules: {
+      // Error rules
+      '@typescript-eslint/no-explicit-any': 'error',
+      '@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+      '@typescript-eslint/explicit-function-return-type': 'off',
+      '@typescript-eslint/no-non-null-assertion': 'warn',
+      '@typescript-eslint/no-empty-interface': 'warn',
+      '@typescript-eslint/consistent-type-imports': ['error', { prefer: 'type-imports' }],
+
+      // Security rules
+      'no-eval': 'error',
+      'no-implied-eval': 'error',
+      'no-new-func': 'error',
+      'no-unsafe-optional-chaining': 'error',
+
+      // Code quality
+      'no-console': ['warn', { allow: ['warn', 'error'] }],
+      'no-debugger': 'error',
+      'no-duplicate-imports': 'error',
+      'no-unreachable': 'error',
+      'no-constant-condition': 'warn',
+      'prefer-const': 'error',
+      'no-var': 'error',
+      'eqeqeq': ['error', 'always'],
+      'curly': ['error', 'multi-line'],
+
+      // React-specific
+      'react/jsx-no-duplicate-props': 'error',
+      'react/jsx-no-undef': 'error',
+      'react/no-direct-mutation-state': 'error',
+      'react/no-unused-state': 'warn',
+    },
+  },
+  {
+    files: ['**/*.js'],
+    rules: {
+      '@typescript-eslint/no-var-requires': 'off',
+    },
+  },
+];

frontend/package.json

@@ -7,7 +7,7 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "preview": "vite preview",
-    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "lint": "eslint src/ --ext .ts,.tsx --max-warnings 0",
     "type-check": "tsc --noEmit"
   },
   "dependencies": {