feat(processor): 实现批量写库容错机制并添加失败统计

添加数据库批量写入失败处理逻辑，当批量写入失败时自动切换为逐条写入
记录失败数据并统计失败数量，同时更新相关测试和统计模块
符合新增的批量写库容错需求规范

test/stats.test.js

@@ -8,16 +8,19 @@ describe('StatsCounters', () => {
     stats.incDbWritten(3);
     stats.incFiltered(2);
     stats.incKafkaPulled(5);
+    stats.incDbWriteFailed(4);
 
     const first = stats.snapshotAndResetMinute();
     assert.equal(first.dbWritten, 3n);
     assert.equal(first.filtered, 2n);
     assert.equal(first.kafkaPulled, 5n);
+    assert.equal(first.dbWriteFailed, 4n);
 
     const second = stats.snapshotAndResetMinute();
     assert.equal(second.dbWritten, 0n);
     assert.equal(second.filtered, 0n);
     assert.equal(second.kafkaPulled, 0n);
+    assert.equal(second.dbWriteFailed, 0n);
   });
 });
 
@@ -27,6 +30,7 @@ describe('StatsReporter', () => {
     stats.incDbWritten(7);
     stats.incFiltered(8);
     stats.incKafkaPulled(9);
+    stats.incDbWriteFailed(2);
 
     const calls = { push: [] };
     const redis = {
@@ -39,13 +43,15 @@ describe('StatsReporter', () => {
     const reporter = new StatsReporter({ redis, stats });
     reporter.flushOnce();
 
-    assert.equal(calls.push.length, 3);
+    assert.equal(calls.push.length, 4);
     assert.equal(calls.push[0].level, 'info');
     assert.equal(calls.push[1].level, 'info');
     assert.equal(calls.push[2].level, 'info');
+    assert.equal(calls.push[3].level, 'info');
     assert.match(calls.push[0].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} 数据库写入量: 7条$/);
-    assert.match(calls.push[1].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} 数据过滤量: 8条$/);
-    assert.match(calls.push[2].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} Kafka拉取量: 9条$/);
+    assert.match(calls.push[1].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} 数据库写入失败量: 2条$/);
+    assert.match(calls.push[2].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} 数据过滤量: 8条$/);
+    assert.match(calls.push[3].message, /^\[STATS\] \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3} Kafka拉取量: 9条$/);
   });
 });