Quotas: usage as a share, and their statistics per rule

What a quota used shows its percentage of the allowance on the Rules
page (line and dialog), the dashboard and in hc quotas. Statistics'
Quotas card links each entry to its rule, named, without the share of
the total; per-address quotas are in it at last: their quota:rN series
is the sum of their addresses.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/e2e.sh

@@ -322,7 +322,7 @@ send 2000000 >/dev/null 2>&1
 run "used up: the device is cut off" 1 send 1000
 run "the usage" 0 H quotas
 contains "e2e quota.*1.0 MB each.*by hand"
-contains "$CLIENT4 (e2e-client)  *1\.[0-9] MB"
+contains "$CLIENT4 (e2e-client)  *1\.[0-9] MB (1[0-9][0-9]%)"
 stop; start
 run "after a restart, still used up" 1 send 1000
 run "the usage after a restart" 0 H quotas
@@ -348,7 +348,7 @@ run "within the quota" 0 send 300000
 run "to one total" 0 H rule update "$QR" --quota 1mbytes,over
 not_contains "quota_restarts"
 run "the total carried over" 0 H quotas
-contains "e2e quota)  *[0-9.]* KB"
+contains "e2e quota)  *[0-9.]* KB ([0-9]*%)"
 run "per destination starts again" 0 H rule update "$QR" --quota 1mbytes,over,per-destination
 contains "quota_restarts"
 run "the quota rule goes" 0 H rule delete -y "$QR"