Remove the CrowdSec decision feed (closes #315)

sneak ruled to remove it. Gone: the heuristic crowdsec, the ban cause
crowdsec and its earlier_bans count, the tag crowdsec, the settings
SWW_WAF_CROWDSEC_LAPI_URL and SWW_WAF_CROWDSEC_LAPI_KEY, the decision
list fetch and parse in internal/reputation, their tests, and every
mention in the README, SPEC.md and docs/. EVALUATION.md keeps its
comparison of tools.

The ban ledger's internal ban function loses its expires parameter,
which only CrowdSec bans used.

Model: opus-5-5

internal/requestlog/requestlog.go

@@ -29,9 +29,8 @@ const (
 	ActionClientIsRateLimited = "client_is_rate_limited"
 
 	// ActionTemporarilyBanned is a request refused because a ban that runs
-	// out covers its client, or because it matched a ban rule, asked for a
-	// trap path or the CrowdSec decision list lists its client, and so made
-	// such a ban.
+	// out covers its client, or because it matched a ban rule or asked for a
+	// trap path, and so made such a ban.
 	ActionTemporarilyBanned = "temporarily_banned"
 
 	// ActionPermanentlyBanned is a request refused because a ban that never
@@ -184,8 +183,7 @@ type Line struct {
 	// LimitHitMinuteRefusals for the refusal limit.
 	LimitHit string `json:"limit_hit,omitempty"`
 	// Reputation are the URLs of the blocklists that list the client, then
-	// that of the CrowdSec decision list when it does, then the DNSBL zones
-	// whose verdict lists it, their keys masked, then abuseipdb when its
+	// the DNSBL zones whose verdict lists it, their keys masked, then abuseipdb when its
 	// score is a hit.
 	Reputation []string `json:"reputation,omitempty"`
 	// Tags are the request's tags, sorted.