Request tags, with refusing and limits per tag (closes #175)

Each request gets sorted tags from the lookup, new address lists, the
reputation sources and the rule matches, logged as `tags`. New settings:
`SWW_TAG_LISTS`, `SWW_TAG_DENY`, `SWW_TAG_LIMIT_PERCENT`. They replace
`SWW_ASN_LIMIT_PERCENT`, `SWW_COUNTRY_LIMIT_PERCENT` and
`SWW_DENIED_COUNTRIES`. New heuristics `tag_lists` and `tag_deny`; the
latter runs before the rate limits and again after the Core Rule Set.

Model: opus-5-5

internal/requestlog/requestlog.go

@@ -44,10 +44,11 @@ const (
 	// ActionDenied is a request refused because its client is in
 	// SWW_DENY_NETS, in a blocklist while SWW_BLOCKLIST_ACTION is deny,
 	// or listed by a DNSBL zone, or scored a hit by AbuseIPDB, while
-	// SWW_REPUTATION_ACTION is deny.
+	// SWW_REPUTATION_ACTION is deny, or that carries a tag in SWW_TAG_DENY.
 	ActionDenied = "denied"
 
-	// ActionCountryDenied is a request refused for its client's country.
+	// ActionCountryDenied is a request refused because its client's country
+	// is not in SWW_EXCLUSIVELY_ALLOWED_COUNTRIES.
 	ActionCountryDenied = "country_denied"
 	// ActionAdmin is a request discriminator answered at one of its own
 	// endpoints, or a question about a path under /_sww/.
@@ -179,6 +180,8 @@ type Line struct {
 	// 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.
+	Tags []string `json:"tags,omitempty"`
 	// Offence is the offence the request was held as, OffenceLimit.
 	Offence string `json:"offence,omitempty"`
 	// BanExpires is when the ban the request made, or was refused under,