chore: React 19 + Vite 7 + ESLint 9 + Zustand 5 업그레이드

- React 18.2 → 19.2.4, react-dom 19.2.4
- Vite 5.2.10 → 7.3.1, @vitejs/plugin-react 5.1.4
- ESLint 8.44 → 9.39.2 flat config, typescript-eslint 8.55.0
- eslint-plugin-react-hooks 7.0.1 (신규 규칙 warn 설정)
- Zustand 4.5 → 5.0.11 (shallow → useShallow 마이그레이션)
- sass 1.77.8 → 1.97.3
- sockjs-client, flatgeobuf 미사용 패키지 제거
- react-router-dom v7 future flag 적용
- vite.config.ts: defineConfig 함수형, build.target: es2022

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.eslintrc.cjs

@@ -1,27 +0,0 @@
-module.exports = {
-  root: true,
-  env: { browser: true, es2020: true },
-  extends: [
-    'eslint:recommended',
-    'plugin:@typescript-eslint/recommended',
-    'plugin:react-hooks/recommended',
-  ],
-  ignorePatterns: ['dist', '.eslintrc.cjs'],
-  parser: '@typescript-eslint/parser',
-  parserOptions: {
-    ecmaVersion: 'latest',
-    sourceType: 'module',
-  },
-  plugins: ['react-refresh'],
-  rules: {
-    'react-refresh/only-export-components': [
-      'warn',
-      { allowConstantExport: true },
-    ],
-    '@typescript-eslint/no-explicit-any': 'warn',
-    '@typescript-eslint/no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
-  },
-  settings: {
-    react: { version: 'detect' },
-  },
-};

.githooks/pre-commit

@@ -19,7 +19,7 @@ fi
 # ESLint 검증 (설정 파일이 있는 경우만)
 if [ -f ".eslintrc.js" ] || [ -f ".eslintrc.json" ] || [ -f ".eslintrc.cjs" ] || [ -f "eslint.config.js" ] || [ -f "eslint.config.mjs" ]; then
     echo "pre-commit: ESLint 검증 중..."
-    npx eslint src/ --ext .ts,.tsx --quiet 2>&1
+    npx eslint src/ --quiet 2>&1
     LINT_RESULT=$?
 
     if [ $LINT_RESULT -ne 0 ]; then