servewaf answers rproxy's question about each request and takes its report (closes #170)

`smallwebwaf servewaf` runs today's checks on the visitor's request each
question carries, answers rproxy, and passes nothing to an app. rproxy reports
every request servewaf answered. A report counts an allowed request's bytes and
writes servewaf's second log line. The table holds a copy of what a report
needs, never the request, so a report cannot reach a request being handled.

Judgement call: a question's body is read before any check; over 64 KiB gets 400.
Judgement call: a report's bytes and durations have ceilings, so they cannot overflow.
Judgement call: a `close` disposition for SWWAF_BAN_RESPONSE=close.

Model: opus-5-5

internal/proxy/anomaly_internal_test.go

@@ -15,9 +15,11 @@ func TestWithEveryAnomalyThresholdOffARequestIsNotCounted(t *testing.T) {
 	// anomaly counters, nor a clock, and the request no response: reading
 	// any of them to count the request panics.
 	rq := &request{
-		h:        &handler{config: &config.Config{LookupSource: "geojs"}},
-		client:   netip.MustParseAddr("203.0.113.9"),
-		lookedUp: true,
+		decision: decision{
+			client:   netip.MustParseAddr("203.0.113.9"),
+			lookedUp: true,
+		},
+		h: &handler{config: &config.Config{LookupSource: "geojs"}},
 	}
 
 	defer func() {