refactor: simplify architecture and harden lifecycle

Remove obsolete implementations, centralize background task ownership and terminal-state recovery, consolidate frontend routing and log streaming, and enforce project-wide verification in CI.

web/eslint.config.js

@@ -0,0 +1,38 @@
+import js from '@eslint/js'
+import eslintConfigPrettier from 'eslint-config-prettier'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  {
+    ignores: ['coverage', 'dist'],
+  },
+  {
+    files: ['**/*.{js,mjs,cjs}'],
+    ...js.configs.recommended,
+  },
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [...tseslint.configs.recommended],
+    plugins: {
+      'react-hooks': reactHooks,
+      'react-refresh': reactRefresh,
+    },
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        {
+          argsIgnorePattern: '^_',
+          caughtErrorsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+        },
+      ],
+      'react-hooks/exhaustive-deps': 'error',
+      'react-hooks/rules-of-hooks': 'error',
+      'react-refresh/only-export-components': 'off',
+    },
+  },
+  eslintConfigPrettier,
+)