Quotas: reset one address, or give some back

POST /rules/{ref}/reset-quota takes an optional address (one entry of a
per-address quota starts again) and give (bytes taken off what was used,
one address's or everyone's, until the next reset). The firewall keeps
the adjustment for its next apply, which writes the new usage into the
ruleset; housecarld applies at once and saves the usage. hc rule
reset-quota --address/--give; Reset and Give back in the web UI, per
address in the usage dialog.

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

CHANGELOG.md

@@ -8,6 +8,13 @@ All notable changes to Housecarl are documented here. The format follows
 
 ### Added
 
+- **Reset one address's quota, or give some back.** `hc rule
+  reset-quota ID --address ADDR` starts only that device's allowance
+  again; `--give 5gbytes` takes that much off what was used instead (one
+  address's, or everyone's): extra allowance until the next reset,
+  without changing the rule. In the web UI: **Give back…** beside a
+  quota's Reset, and Reset and Give back for each address in its usage
+  dialog. `POST /rules/{ref}/reset-quota` takes `address` and `give`.
 - **Names beside inside addresses.** Connections, the log, quota usage,
   the dashboard's quotas and the statistics' devices and blocked
   sources show each inside address's name, found by a reverse lookup: