feat: Implement active workout flow with status management

- Added `status`, `total_sets`, and `total_volume` fields to the Workout model.
- Introduced `source_kind`, `title_snapshot`, and `image_s3_url_snapshot` fields to the WorkoutItem model.
- Created endpoints for managing active workouts, including finishing and discarding workouts.
- Updated workout creation to ensure only one active workout exists per user.
- Implemented batch addition of workout sets and updates to workout set details.
- Enhanced database schema with Alembic migrations to support new fields and constraints.
- Added validation to ensure at least one field is provided for workout set updates.
- Updated calorie estimation logic to reflect new workout set structure.

frontend/src/features/catalog/CatalogCard.tsx

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+import type { ReactNode } from "react";
+
+import type { CatalogEntity } from "../../types";
+
+export function CatalogCard({ entity, action }: { entity: CatalogEntity; action?: ReactNode }) {
+  return (
+    <article className="card catalog-card">
+      {entity.image_s3_url ? <img src={entity.image_s3_url} alt="" /> : <div className="image-placeholder">TW</div>}
+      <div>
+        <span className={entity.is_builtin ? "pill" : "pill user"}>{entity.is_builtin ? "стандартное" : "мое"}</span>
+        <h3>{entity.name}</h3>
+        <p>{entity.description || "Без описания"}</p>
+        {action}
+      </div>
+    </article>
+  );
+}

frontend/src/features/catalog/CatalogPage.tsx

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+import { Link } from "@tanstack/react-router";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import type { FormEvent } from "react";
+import { useMemo, useState } from "react";
+
+import { useAuth } from "../auth/AuthContext";
+import { api } from "../../api";
+import type { CatalogKind } from "../../types";
+import { CatalogCard } from "./CatalogCard";
+import { useCatalog } from "./hooks";
+
+export function CatalogPage({ kind }: { kind: CatalogKind }) {
+  const { auth } = useAuth();
+  const token = auth.accessToken;
+  const queryClient = useQueryClient();
+  const { equipment, exercises } = useCatalog(token);
+  const [name, setName] = useState("");
+  const [description, setDescription] = useState("");
+  const [file, setFile] = useState<File | null>(null);
+
+  const list = useMemo(() => (kind === "exercise" ? exercises.data : equipment.data) ?? [], [kind, exercises.data, equipment.data]);
+
+  const createMutation = useMutation({
+    mutationFn: async () => {
+      const image = file ? await api.uploadImage(token, kind, file) : {};
+      const payload = { name, description, ...image };
+      return kind === "equipment" ? api.createEquipment(token, payload) : api.createExercise(token, payload);
+    },
+    onSuccess: () => {
+      setName("");
+      setDescription("");
+      setFile(null);
+      void queryClient.invalidateQueries({ queryKey: ["catalog", kind === "equipment" ? "equipment" : "exercises"] });
+    },
+  });
+
+  function submit(event: FormEvent) {
+    event.preventDefault();
+    createMutation.mutate();
+  }
+
+  return (
+    <section className="stack">
+      <div className="page-header">
+        <div>
+          <p className="eyebrow">Catalog</p>
+          <h2>{kind === "exercise" ? "Упражнения" : "Тренажеры"}</h2>
+        </div>
+        <div className="segmented">
+          <Link to="/catalog/exercises" activeProps={{ className: "active" }}>Упражнения</Link>
+          <Link to="/catalog/equipment" activeProps={{ className: "active" }}>Тренажеры</Link>
+        </div>
+      </div>
+
+      <form className="card form-grid" onSubmit={submit}>
+        <label>
+          Название
+          <input value={name} onChange={(event) => setName(event.target.value)} required />
+        </label>
+        <label>
+          Описание
+          <input value={description} onChange={(event) => setDescription(event.target.value)} />
+        </label>
+        <label>
+          Картинка
+          <input type="file" accept="image/png,image/jpeg,image/webp" onChange={(event) => setFile(event.target.files?.[0] ?? null)} />
+        </label>
+        <button className="primary" disabled={createMutation.isPending}>{createMutation.isPending ? "Сохранение..." : "Добавить"}</button>
+        {createMutation.error && <p className="error">{createMutation.error.message}</p>}
+      </form>
+
+      <div className="catalog-grid">
+        {list.map((entity) => <CatalogCard entity={entity} key={entity.id} />)}
+      </div>
+    </section>
+  );
+}

frontend/src/features/catalog/hooks.ts

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+import { useQuery } from "@tanstack/react-query";
+
+import { api } from "../../api";
+
+export function useCatalog(token: string) {
+  const equipment = useQuery({ queryKey: ["catalog", "equipment"], queryFn: () => api.equipment(token) });
+  const exercises = useQuery({ queryKey: ["catalog", "exercises"], queryFn: () => api.exercises(token) });
+  return { equipment, exercises };
+}