fix(lte): data-cap usage was never counted (v0.23.26-beta)

Reported from the field: manual SMS send works, but no traffic is accumulated.
Correct on both counts, and the cause is a single wrong call shape made invisible
by a swallowed error.

The interface filter was passed as a parameter rather than a RouterOS query
word, so the request went out as `=?name=lte1` and the device answered "unknown
parameter ?name". That threw on every poll, a `.catch(() => [])` turned it into
an empty result, and the empty result made the tracker return early — every
time, in silence. The rule looked configured, the usage bar sat at zero, and
nothing anywhere said why.

Proved against hardware rather than reasoned about:

  as-shipped   -> THREW: unknown parameter ?name
  query-word   -> rows: 1  ether1 rx=4997765728

The filter now goes through the client's query-word argument, falls back to an
unfiltered read if a filtered one comes back empty, and — the part that matters
more — logs instead of discarding. A counter read that fails, or an interface
that is not in the result, now says so. The tracker also warns when it has no
counters, because a rule that exists and never counts is precisely the failure
the user experiences.

Accumulation verified end to end on real hardware afterwards: first poll
establishes a baseline and counts nothing, second and third accumulate 118 KB
then 144 KB, with the period keyed to the configured local date.

Worth recording why this shipped. The pure accounting logic has eighteen tests
and all of them pass — reboot handling, midnight rollover across zones, margin,
cooldown. None of it ran, because the one integration point those tests cannot
reach was wrong. Verifying the API paths and the configuration flow, as was done
before release, exercised everything except the thing the feature is for.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

README.md

@@ -6,7 +6,7 @@
 </p>
 
 <p align="center">
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