AS number and country looked up for every client (closes #95)

GeoJS's geo.json is asked about every new visitor unless
SWWAF_LOOKUP_SOURCE is off. A request waits for its client's first
answer only while a country list or SWWAF_ADD_LOOKUP_HEADERS needs it;
otherwise the answer reaches the client's history and ban notes when it
comes. The AS number and name go beside the country in the request log,
history, ban notes, alerts and lookups.json, with metrics by AS number;
64512 counts as unknown. A client's own X-Client-ASN and
X-Client-Country never reach the app, whatever the setting says, and
make example-app sends no address to GeoJS.

Judgement call: AS numbers are written AS64496, as SPEC's settings write them.
Judgement call: SWWAF_LOOKUP_TIMEOUT is added, default 1s, and cannot be off.

Model: opus-5-5

internal/proxy/bans_test.go

@@ -281,6 +281,8 @@ func TestBanNotes(t *testing.T) {
 		Cause:    bans.CauseLimit,
 		Reason:   "requests per minute over the limit of 1",
 		Notes: bans.Notes{
+			ASN:     asnDE,
+			ASName:  asNameDE,
 			Country: "DE",
 			Limit:   1,
 			Window:  minute,
@@ -362,8 +364,9 @@ func (c *clock) advance(d time.Duration) {
 
 // startWithClock starts smallwebwaf in front of an app that answers 200,
 // with the settings in env on top of trusting localhost's
-// X-Forwarded-For, clients' countries looked up at geojsURL, and a clock
-// set to midnight, the start of a bucket in every window.
+// X-Forwarded-For, clients' AS numbers and countries looked up at
+// geojsURL, and a clock set to midnight, the start of a bucket in every
+// window.
 func startWithClock(
 	t *testing.T, geojsURL string, env map[string]string,
 ) (*sender, *clock, *proxy.Server) {