fix(honeypot/naive): apply robot9001 style delays (#1632)

Currently the honeypotting feature has no limits or delays anywhere and
uses that to feed an internal greylist of IP networks. This can cause
issues such as in #1613 where Claude's crawler seemed to pick up on it
and egress data at over one megabit per second until the administrator
noticed and blocked the address range.

This takes a different approach by inspiration of how the classic #xkcd
IRC bot Robot9000 works. The first time a given IPv4 /24 or IPv6 /48
visits a honepot page, Anubis sleeps for 1 millisecond. The second it
sleeps for two milliseconds. The third is four milliseconds and so on.
The goal of this is to make the scraping inherently self-limiting such
that the scrapers go off in their own corner where they won't really
hurt anyone.

Let's see if this works out according to keikaku.

Ref: https://github.com/TecharoHQ/anubis/issues/1613

Signed-off-by: Xe Iaso <me@xeiaso.net>

docs/docs/CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 <!-- This changes the project to: -->
 
 - Patch [GHSA-6wcg-mqvh-fcvg](https://github.com/TecharoHQ/anubis/security/advisories/GHSA-6wcg-mqvh-fcvg) by containing subrequest logic to Anubis instances in subrequest mode.
+- Implement robot9001 style delays on the honeypot feature so that the first hit takes 1 millisecond, the second takes 2, etc.
 - Move metrics server configuration to [the policy file](./admin/policies.mdx#metrics-server).
 - Expose [pprof endpoints](https://pkg.go.dev/net/http/pprof) on the metrics listener to enable profiling Anubis in production.
 - fix: prevent nil pointer panic in challenge validation when threshold rules match during PassChallenge (#1463)

internal/honeypot/naive/naive.go

@@ -5,6 +5,7 @@ import (
 	_ "embed"
 	"fmt"
 	"log/slog"
+	"math"
 	"math/rand/v2"
 	"net/http"
 	"net/netip"
@@ -168,6 +169,9 @@ func (i *Impl) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	millisecondAmount := math.Pow(float64(networkCount), 2)
+	time.Sleep(time.Duration(millisecondAmount) * time.Millisecond)
+
 	spins := i.makeSpins()
 	affirmations := i.makeAffirmations()
 	title := i.makeTitle()