Add supplements, kettlebell, calendar, push notifications, and PWA support

- Supplement tracking: CRUD endpoints, /today, /logs, Supplements page
- Kettlebell workouts: session tracking, analytics endpoint, ActiveSession page
- Calendar module: events CRUD, calendar components
- Push notifications: VAPID keys, PushSubscription model, APScheduler reminders,
  service worker with push/notificationclick handlers, Profile notifications UI
- PWA: vite-plugin-pwa, manifest, icons, service worker generation
- Frontend: TypeScript types, API modules, ConfirmModal, toast notifications
- Auth fixes: password hashing, nutrition endpoint auth
- CLAUDE.md: project documentation and development guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/api/kettlebell.ts

@@ -0,0 +1,51 @@
+import client from './client';
+import type { KettlebellSession, KettlebellSetLog } from '../types/kettlebell';
+
+export interface GenerateSessionRequest {
+    focus: string;
+    duration_minutes: number;
+    available_weights: number[];
+}
+
+export interface LogSetRequest {
+    exercise_order: number;
+    set_number: number;
+    actual_reps: number;
+    actual_weight_kg: number;
+    actual_duration_seconds: number;
+    perceived_effort: number;
+}
+
+export interface CompleteSessionRequest {
+    notes?: string;
+}
+
+export const generateSession = (data: GenerateSessionRequest) =>
+    client.post<KettlebellSession>('/kettlebell/generate', data).then(r => r.data);
+
+export const getSessions = () =>
+    client.get<KettlebellSession[]>('/kettlebell/').then(r => r.data);
+
+export const getSession = (id: number) =>
+    client.get<KettlebellSession>(`/kettlebell/${id}`).then(r => r.data);
+
+export const startSession = (id: number) =>
+    client.patch<KettlebellSession>(`/kettlebell/${id}/start`).then(r => r.data);
+
+export const logSet = (id: number, data: LogSetRequest) =>
+    client.post<KettlebellSetLog>(`/kettlebell/${id}/sets`, data).then(r => r.data);
+
+export const getSets = (id: number) =>
+    client.get<KettlebellSetLog[]>(`/kettlebell/${id}/sets`).then(r => r.data);
+
+export const completeSession = (id: number, data: CompleteSessionRequest = {}) =>
+    client.patch<KettlebellSession>(`/kettlebell/${id}/complete`, data).then(r => r.data);
+
+export const retrySession = (id: number) =>
+    client.post<KettlebellSession>(`/kettlebell/${id}/retry`).then(r => r.data);
+
+export const abandonSession = (id: number) =>
+    client.patch<KettlebellSession>(`/kettlebell/${id}/abandon`).then(r => r.data);
+
+export const deleteSession = (id: number) =>
+    client.delete(`/kettlebell/${id}`);