refactor(api)!: align client with canonical HTTP contract

Route all feature requests through business API modules, sync generated DTOs, and add communication tests and architecture documentation.

BREAKING CHANGE: migrate the client to plural resource paths, canonical snake_case fields, ISO timestamps, and explicit paginated responses.

eslint.config.js

@@ -43,11 +43,33 @@ export default defineConfig([
         },
     },
     {
-        files: ['*.{js,mjs,cjs,ts,mts,cts}', 'scripts/**/*.{js,mjs,cjs,ts,mts,cts}'],
+        files: [
+            '*.{js,mjs,cjs,ts,mts,cts}',
+            'scripts/**/*.{js,mjs,cjs,ts,mts,cts}',
+            'tests/**/*.mjs',
+        ],
         languageOptions: {
             globals: globals.node,
         },
     },
+    {
+        files: ['src/features/**/*.{ts,vue}'],
+        ignores: ['src/features/*/api.ts', 'src/features/auth/authClient.ts'],
+        rules: {
+            'no-restricted-imports': [
+                'error',
+                {
+                    paths: [
+                        {
+                            name: '@/lib/api',
+                            importNames: ['apiRequest'],
+                            message: '请通过所属业务的 api.ts 调用接口。',
+                        },
+                    ],
+                },
+            ],
+        },
+    },
     // Keep formatting in Prettier; this must follow the rule presets.
     prettier,
 ])