Ban notes name the reputation sources that listed the client (closes #109)

A ban's notes, in bans.json and in its alert, gain `reputation`: each
blocklist, DNSBL zone or AbuseIPDB that listed the client when the ban
was made, as its `source`, named and ordered as in the request log's
`reputation`, with AbuseIPDB's `score`. It is left out when none did.
README.md shows it in a bans.json example.

Notes now hold a list, so bans can no longer be compared with ==: the
tests compare them with reflect.DeepEqual.

Judgement call: the score is a pointer, so a score of 0, a hit while
SWWAF_ABUSEIPDB_MIN_SCORE is 0, is still written.

Model: opus-5-5

internal/proxy/bans.go

@@ -127,15 +127,16 @@ func (rq *request) banForLimit(now time.Time, hit ratelimit.Hit, status int) {
 	}
 
 	notes := bans.Notes{
-		ASN:      rq.line.ASN,
-		ASName:   rq.line.ASName,
-		Country:  rq.line.Country,
-		Kind:     hit.Kind,
-		Limit:    hit.Limit,
-		Window:   hit.Window,
-		Count:    hit.Count,
-		Request:  rq.noted(now, status),
-		Requests: rq.netblockRequests(netblock),
+		ASN:        rq.line.ASN,
+		ASName:     rq.line.ASName,
+		Country:    rq.line.Country,
+		Kind:       hit.Kind,
+		Limit:      hit.Limit,
+		Window:     hit.Window,
+		Count:      hit.Count,
+		Reputation: rq.reputation,
+		Request:    rq.noted(now, status),
+		Requests:   rq.netblockRequests(netblock),
 	}
 
 	percent := rq.limitPercent
@@ -174,13 +175,14 @@ func (rq *request) banForAttack(now time.Time, rule rules.Rule) {
 	}
 
 	notes := bans.Notes{
-		ASN:      rq.line.ASN,
-		ASName:   rq.line.ASName,
-		Country:  rq.line.Country,
-		RuleID:   rule.ID,
-		Target:   rule.Target,
-		Request:  rq.noted(now, rq.h.config.BanResponse),
-		Requests: rq.netblockRequests(netblock),
+		ASN:        rq.line.ASN,
+		ASName:     rq.line.ASName,
+		Country:    rq.line.Country,
+		RuleID:     rule.ID,
+		Target:     rule.Target,
+		Reputation: rq.reputation,
+		Request:    rq.noted(now, rq.h.config.BanResponse),
+		Requests:   rq.netblockRequests(netblock),
 	}
 
 	if rq.h.config.Observe {