feat: align docs with code, finish_place, registered status, UI filters, tests, CI

- Add PLAN.md and sync backend docs, .env.example, API doc (404 details)
- Document mock DB and PORT/API_PORT in docs/backend.md; README monorepo + frontend/.env.example
- Migration 002: finish_place column, status registered; mapper and mock DB updated
- Frontend: registered status, finishPlace, calendar year/month filters, pace sparkline
- Extract createApp for tests; supertest + tsx; GitHub Actions CI

Made-with: Cursor

frontend/src/pages/RacesPage.tsx

@@ -1,8 +1,41 @@
 import { useEffect, useMemo, useState } from "react";
 import { Link } from "react-router-dom";
-import type { Race } from "../api";
+import type { Race, RacesQuery } from "../api";
 import { ApiError, getRaces } from "../api";
-import { formatDistance, formatRaceDate, getRaceStatusLabel, splitRacesByDate } from "../lib";
+import {
+  formatDistance,
+  formatRaceDate,
+  getRaceStatusClassName,
+  getRaceStatusLabel,
+  splitRacesByDate,
+} from "../lib";
+
+const MONTH_OPTIONS: { value: string; label: string }[] = [
+  { value: "", label: "Все месяцы" },
+  { value: "1", label: "Январь" },
+  { value: "2", label: "Февраль" },
+  { value: "3", label: "Март" },
+  { value: "4", label: "Апрель" },
+  { value: "5", label: "Май" },
+  { value: "6", label: "Июнь" },
+  { value: "7", label: "Июль" },
+  { value: "8", label: "Август" },
+  { value: "9", label: "Сентябрь" },
+  { value: "10", label: "Октябрь" },
+  { value: "11", label: "Ноябрь" },
+  { value: "12", label: "Декабрь" },
+];
+
+function yearSelectOptions(): number[] {
+  const current = new Date().getFullYear();
+  const start = current - 2;
+  const end = current + 4;
+  const years: number[] = [];
+  for (let y = start; y <= end; y += 1) {
+    years.push(y);
+  }
+  return years;
+}
 
 function getErrorMessage(error: unknown): string {
   if (error instanceof ApiError) {
@@ -31,15 +64,7 @@ function RaceList(props: { title: string; races: Race[] }): JSX.Element {
                   {formatRaceDate(race.date)} · {formatDistance(race.distanceKm)}
                 </p>
               </div>
-              <span
-                className={
-                  race.status === "completed"
-                    ? "race-card__status race-card__status--completed"
-                    : "race-card__status race-card__status--planned"
-                }
-              >
-                {getRaceStatusLabel(race.status)}
-              </span>
+              <span className={getRaceStatusClassName(race.status)}>{getRaceStatusLabel(race.status)}</span>
             </li>
           ))}
         </ul>
@@ -54,13 +79,33 @@ export function RacesPage(): JSX.Element {
   const [races, setRaces] = useState<Race[]>([]);
   const [isLoading, setIsLoading] = useState<boolean>(true);
   const [errorMessage, setErrorMessage] = useState<string | null>(null);
+  const [yearFilter, setYearFilter] = useState<string>("");
+  const [monthFilter, setMonthFilter] = useState<string>("");
+
+  const listQuery = useMemo((): RacesQuery | undefined => {
+    const q: RacesQuery = {};
+    if (yearFilter !== "") {
+      const y = parseInt(yearFilter, 10);
+      if (!Number.isNaN(y)) {
+        q.year = y;
+      }
+    }
+    if (monthFilter !== "") {
+      const m = parseInt(monthFilter, 10);
+      if (!Number.isNaN(m)) {
+        q.month = m;
+      }
+    }
+    return Object.keys(q).length > 0 ? q : undefined;
+  }, [yearFilter, monthFilter]);
 
   useEffect(() => {
     let isMounted = true;
 
     async function loadRaces(): Promise<void> {
+      setIsLoading(true);
       try {
-        const items = await getRaces();
+        const items = await getRaces(listQuery);
         if (!isMounted) {
           return;
         }
@@ -82,20 +127,11 @@ export function RacesPage(): JSX.Element {
     return () => {
       isMounted = false;
     };
-  }, []);
+  }, [listQuery]);
 
   const { upcoming, past } = useMemo(() => splitRacesByDate(races), [races]);
 
-  if (isLoading) {
-    return (
-      <section className="page page--races" aria-busy="true">
-        <h1 className="page__title">Календарь стартов</h1>
-        <p className="page__subtitle">Загружаем данные...</p>
-      </section>
-    );
-  }
-
-  if (errorMessage) {
+  if (errorMessage && races.length === 0 && !isLoading) {
     return (
       <section className="page page--races" role="alert">
         <h1 className="page__title">Календарь стартов</h1>
@@ -109,6 +145,48 @@ export function RacesPage(): JSX.Element {
       <h1 className="page__title">Календарь стартов</h1>
       <p className="page__subtitle">Будущие и прошедшие старты в одном месте.</p>
 
+      <div className="races-filter" role="search" aria-label="Фильтр по дате">
+        <label className="races-filter__field">
+          <span className="races-filter__label">Год</span>
+          <select
+            className="races-filter__select"
+            value={yearFilter}
+            onChange={(event) => {
+              setYearFilter(event.target.value);
+            }}
+          >
+            <option value="">Все года</option>
+            {yearSelectOptions().map((y) => (
+              <option key={y} value={String(y)}>
+                {y}
+              </option>
+            ))}
+          </select>
+        </label>
+        <label className="races-filter__field">
+          <span className="races-filter__label">Месяц</span>
+          <select
+            className="races-filter__select"
+            value={monthFilter}
+            onChange={(event) => {
+              setMonthFilter(event.target.value);
+            }}
+          >
+            {MONTH_OPTIONS.map((opt) => (
+              <option key={opt.value || "all"} value={opt.value}>
+                {opt.label}
+              </option>
+            ))}
+          </select>
+        </label>
+      </div>
+
+      {isLoading ? (
+        <p className="page__subtitle" aria-busy="true">
+          Загружаем данные...
+        </p>
+      ) : null}
+
       <div className="race-lists">
         <RaceList title="Будущие" races={upcoming} />
         <RaceList title="Прошедшие" races={past} />