优化：降低访问日志噪声并增加日志文件轮转

apps/backend/src/middleware/access-log.test.ts

@@ -0,0 +1,15 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+
+import { resolveAccessLogLevel } from './access-log.js'
+
+test('resolveAccessLogLevel sends successful reads to debug', () => {
+  assert.equal(resolveAccessLogLevel('GET', 200), 'debug')
+  assert.equal(resolveAccessLogLevel('head', 304), 'debug')
+})
+
+test('resolveAccessLogLevel keeps writes and failures at info', () => {
+  assert.equal(resolveAccessLogLevel('POST', 200), 'info')
+  assert.equal(resolveAccessLogLevel('GET', 404), 'info')
+  assert.equal(resolveAccessLogLevel('GET', 500), 'info')
+})