优化：降低访问日志噪声并增加日志文件轮转

apps/backend/src/config/defaults.ts

@@ -19,6 +19,8 @@ export function createDefaultRuntimeConfig(projectRoot: string): RuntimeConfig {
       // 对接日志默认只保留 warn/error，避免 integration-*.log 被 info 刷爆
       integrationLevel: 'warn',
       retentionDays: 30,
+      maxFileSizeMb: 20,
+      maxFiles: 5,
     },
 
     retention: {

apps/backend/src/config/env-overrides.test.ts

@@ -13,6 +13,8 @@ test('applyEnvOverrides maps typed environment values without mutating base conf
     DATA_ROOT: './tmp/backend-data',
     DATABASE_SSL: 'yes',
     LOG_RETENTION_DAYS: '45',
+    LOG_MAX_FILE_SIZE_MB: '12',
+    LOG_MAX_FILES: '4',
     ADMIN_DEFAULT_USERS_JSON: '[{"username":"admin","password":"secret","role":"admin"}]',
     KAQUAN91_USER_ID: 'kaquan-user',
     KAQUAN91_SECRET: 'kaquan-secret',
@@ -23,6 +25,8 @@ test('applyEnvOverrides maps typed environment values without mutating base conf
   assert.equal(config.data.root, path.resolve('./tmp/backend-data'))
   assert.equal(config.database.ssl, true)
   assert.equal(config.logging.retentionDays, 45)
+  assert.equal(config.logging.maxFileSizeMb, 12)
+  assert.equal(config.logging.maxFiles, 4)
   assert.deepEqual(config.admin.defaultUsers, [
     { username: 'admin', password: 'secret', role: 'admin' },
   ])

apps/backend/src/config/env-overrides.ts

@@ -33,6 +33,8 @@ export const ENV_OVERRIDES: readonly EnvOverride[] = [
   stringEnv('LOG_LEVEL', ['logging', 'level']),
   stringEnv('LOG_INTEGRATION_LEVEL', ['logging', 'integrationLevel']),
   integerEnv('LOG_RETENTION_DAYS', ['logging', 'retentionDays']),
+  integerEnv('LOG_MAX_FILE_SIZE_MB', ['logging', 'maxFileSizeMb']),
+  integerEnv('LOG_MAX_FILES', ['logging', 'maxFiles']),
   integerEnv('RAW_PAYLOAD_RETENTION_DAYS', ['retention', 'rawPayloadDays']),
   integerEnv('TASK_EVENT_RETENTION_DAYS', ['retention', 'taskEventDays']),
   integerEnv('WEBHOOK_EVENT_RETENTION_DAYS', ['retention', 'webhookEventDays']),

apps/backend/src/config/runtime-validation.ts

@@ -52,6 +52,8 @@ export function validateRuntimeConfig(
     })
   }
   requireInteger(issues, 'database.maxConnections', config.database?.maxConnections, { min: 1 })
+  requireOptionalInteger(issues, 'logging.maxFileSizeMb', config.logging?.maxFileSizeMb, { min: 1 })
+  requireOptionalInteger(issues, 'logging.maxFiles', config.logging?.maxFiles, { min: 2 })
   requireOptionalInteger(issues, 'database.idleTimeoutMs', config.database?.idleTimeoutMs, {
     min: 1,
   })