feat(obs): 访问日志 SSOT 与 edge_health，去掉协议兼容层

Agent 仅上报 host_metrics/edge_health/access_logs；业务流量与 UV 由
Server 侧访问日志聚合。新增 of_node_edge_health 与 of_access_log_hourly，
删除 request_reports/openresty 吞吐路径；API 不再暴露 traffic_reports
与 openresty_rx|tx。心跳/离线默认阈值与回填迁移一并入库。

internal/repository/analytics/node_observability_test.go

@@ -14,34 +14,35 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func TestInsertNodeObsOpenresty_EmptyNodeID(t *testing.T) {
-	err := InsertNodeObsOpenresty(context.Background(), analyticsmodel.NodeObsOpenresty{})
+func TestInsertNodeEdgeHealth_EmptyNodeID(t *testing.T) {
+	err := InsertNodeEdgeHealth(context.Background(), analyticsmodel.NodeEdgeHealth{})
 	require.NoError(t, err)
 }
 
-func TestInsertNodeObsOpenresty_UsesModelBatchSQL(t *testing.T) {
+func TestInsertNodeEdgeHealth_UsesEdgeHealthBatchSQL(t *testing.T) {
 	ctx := context.Background()
 	mockBatch := &mockBatch{}
 	mockConn := &mockConn{
 		batch:      mockBatch,
-		batchQuery: analyticsmodel.NodeObsOpenresty{}.BatchInsertSQL(),
+		batchQuery: analyticsmodel.NodeEdgeHealth{}.BatchInsertSQL(),
 	}
 	db.SetChConnForTest(mockConn)
 	t.Cleanup(func() { db.SetChConnForTest(nil) })
 
 	capturedAt := time.Now().UTC()
-	err := InsertNodeObsOpenresty(ctx, analyticsmodel.NodeObsOpenresty{
-		NodeID:               "node-a",
-		CapturedAt:           capturedAt,
-		OpenrestyRxBytes:     100,
-		OpenrestyTxBytes:     200,
-		OpenrestyConnections: 3,
-		CreatedAt:            capturedAt,
+	err := InsertNodeEdgeHealth(ctx, analyticsmodel.NodeEdgeHealth{
+		NodeID:      "node-a",
+		CapturedAt:  capturedAt,
+		Status:      "",
+		Connections: 3,
+		CreatedAt:   capturedAt,
 	})
 	require.NoError(t, err)
 	assert.True(t, mockConn.prepareCalled)
-	assert.Equal(t, analyticsmodel.NodeObsOpenresty{}.BatchInsertSQL(), mockConn.preparedQuery)
+	assert.Equal(t, analyticsmodel.NodeEdgeHealth{}.BatchInsertSQL(), mockConn.preparedQuery)
 	assert.True(t, mockBatch.sendCalled)
 	require.Len(t, mockBatch.rows, 1)
 	assert.Equal(t, "node-a", mockBatch.rows[0][1])
+	assert.Equal(t, "unknown", mockBatch.rows[0][3]) // status default
+	assert.Equal(t, int64(3), mockBatch.rows[0][4])  // connections
 }