[feat](trx-logbook): work a contest, and record what came back

Phase 5 of the logbook: the exchange, the entry sponsors take, and the
confirmations an award counts.

Contest fields go on the contact — the contest, the serials both ways as
numbers and as words, and the zones — because an exchange is not always a
number: a zone, a section or a name goes in as written.  The serial sent and
the contest stay between contacts, since they belong to the session and not
to the contact just logged, and the serial counts on by itself rather than
being retyped forty times an hour.

Cabrillo 3.0 is written because ADIF cannot do this job: sponsors take
Cabrillo and reject everything else.  Its shape is not ADIF's either — the
frequency is kilohertz below 30 MHz and a band designator above it, the modes
are CW, PH, FM, RY and DG, and the contacts go oldest first, as a contest log
is read.  The header cannot be derived from a log — how many operators, how
much power, what the score is claimed to be — so it comes from the operator,
with single-op, low power, all bands and mixed behind it.

QSL, LoTW and eQSL states are held as ADIF's single letters, and anything
else is refused rather than written: a log that grew states of its own would
be one no other program could read.  A contact is confirmed when any one of
the three says so — an award wants a card or an electronic match, not one of
each, and counting them separately would tell the operator they were short of
what they have.

The bands report counts contacts, distinct stations and confirmations per
band, ordered by wavelength as a band plan reads.

Closes #54

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SyX26FCpMQxiBoC7r5K1A7
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/web-fixture.mjs

@@ -309,6 +309,49 @@ export async function startWebFixture({
         response.end(JSON.stringify({ call, worked }));
         return;
       }
+      if (tail === "/statistics") {
+        const bands = new Map();
+        for (const qso of logbook) {
+          const entry = bands.get(qso.band) ?? { band: qso.band, contacts: 0, stations: 0, confirmed: 0, calls: new Set() };
+          entry.contacts += 1;
+          entry.calls.add(qso.call);
+          if (qso.confirmed || qso.qsl_rcvd === "Y" || qso.lotw_qsl_rcvd === "Y") entry.confirmed += 1;
+          bands.set(qso.band, entry);
+        }
+        const list = [...bands.values()].map(({ calls, ...rest }) => ({ ...rest, stations: calls.size }));
+        response.writeHead(200, { "content-type": "application/json" });
+        response.end(JSON.stringify({
+          contacts: logbook.length,
+          confirmed: list.reduce((total, band) => total + band.confirmed, 0),
+          bands: list,
+        }));
+        return;
+      }
+      if (tail === "/export.cbr") {
+        const contest = url.searchParams.get("contest");
+        const entered = contest ? logbook.filter((qso) => qso.contest_id === contest) : logbook;
+        response.writeHead(200, { "content-type": "text/plain" });
+        response.end(`START-OF-LOG: 3.0\nCONTEST: ${contest ?? ""}\n`
+          + entered.map((qso) => `QSO: 14200 PH ${qso.call}\n`).join("")
+          + "END-OF-LOG:\n");
+        return;
+      }
+      if (request.method === "PUT") {
+        const raw = await new Promise((resolve) => {
+          let text = "";
+          request.on("data", (chunk) => { text += chunk; });
+          request.on("end", () => resolve(text));
+        });
+        const input = JSON.parse(raw);
+        const id = tail.replace("/", "");
+        const held = logbook.find((qso) => qso.id === id);
+        if (held) {
+          Object.assign(held, input, { id, confirmed: input.qsl_rcvd === "Y" });
+        }
+        response.writeHead(200, { "content-type": "application/json" });
+        response.end(JSON.stringify(held ?? {}));
+        return;
+      }
       if (tail === "/export.adi") {
         const body = logbook
           .map((qso) => `<CALL:${qso.call.length}>${qso.call}<EOR>\n`)
@@ -337,6 +380,10 @@ export async function startWebFixture({
           gridsquare: input.gridsquare ? String(input.gridsquare).toUpperCase() : null,
           my_rig: input.my_rig,
           operator: input.operator,
+          contest_id: input.contest_id ?? null,
+          stx: input.stx ?? null,
+          srx: input.srx ?? null,
+          confirmed: input.qsl_rcvd === "Y" || input.lotw_qsl_rcvd === "Y",
         };
         logbook.unshift(qso);
         response.writeHead(200, { "content-type": "application/json" });