feat!: migrate ESLint 8 to ESLint 10 with flat config

Replace legacy .eslintrc with eslint.config.mjs flat config. Update to
ESLint 10, typescript-eslint v8, and eslint-plugin-jsdoc v62. Resolve
all lint warnings and tighten configuration.

eslint.config.mjs

@@ -0,0 +1,59 @@
+import eslint from '@eslint/js';
+import { defineConfig } from 'eslint/config';
+import tseslint from 'typescript-eslint';
+import eslintConfigPrettier from 'eslint-config-prettier';
+import jsdoc from 'eslint-plugin-jsdoc';
+
+export default defineConfig(
+  // Global ignores (replaces .eslintignore)
+  {
+    ignores: ['scripts/', 'docs/', 'dist/', 'node_modules/'],
+  },
+
+  // Base configs
+  eslint.configs.recommended,
+  tseslint.configs.recommended,
+
+  // JSDoc plugin
+  jsdoc.configs['flat/recommended'],
+
+  // Prettier (disables conflicting rules)
+  eslintConfigPrettier,
+
+  // Project-specific overrides for TypeScript plugin files
+  {
+    files: ['src/**/*.ts'],
+    rules: {
+      // TypeScript rules
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/no-explicit-any': 'warn',
+      '@typescript-eslint/no-empty-function': 'off',
+      '@typescript-eslint/no-unsafe-function-type': 'off',
+      '@typescript-eslint/no-wrapper-object-types': 'error',
+      '@typescript-eslint/no-empty-object-type': 'warn',
+      '@typescript-eslint/no-namespace': 'off',
+      '@typescript-eslint/no-unused-expressions': 'warn',
+      '@typescript-eslint/no-unsafe-declaration-merging': 'warn',
+      '@typescript-eslint/no-duplicate-enum-values': 'warn',
+      '@typescript-eslint/no-require-imports': 'off',
+      'no-empty': 'warn',
+      'no-irregular-whitespace': 'warn',
+      'no-empty-pattern': 'warn',
+
+      // JSDoc rules - relaxed for plugin wrappers (stub methods, Cordova untyped APIs)
+      'jsdoc/tag-lines': 'off',
+      'jsdoc/require-param-type': 'off',
+      'jsdoc/require-returns-check': 'off',
+      'jsdoc/require-returns-description': 'off',
+      'jsdoc/require-param-description': 'off',
+      'jsdoc/check-tag-names': 'off',
+      'jsdoc/reject-any-type': 'off',
+      'jsdoc/no-undefined-types': 'off',
+      'jsdoc/reject-function-type': 'off',
+      'jsdoc/require-param': 'off',
+      'jsdoc/require-returns': 'off',
+      'jsdoc/check-param-names': 'off',
+      'jsdoc/check-types': 'off',
+    },
+  }
+);