feat: Implement routines feature with CRUD operations and child assignment

- Add backend routines management with add, get, update, delete, and list functionalities.
- Create models for Routine, RoutineItem, RoutineSchedule, and RoutineExtension.
- Develop event types for routine confirmation and modification.
- Implement frontend components for routine assignment, confirmation dialog, and routine management views.
- Add unit tests for routine API and integration tests for routine CRUD flow.
- Create end-to-end test plan for routines feature covering parent and child interactions.

frontend/src/common/__tests__/api.routine.spec.ts

@@ -0,0 +1,60 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+
+import {
+  confirmRoutine,
+  cancelRoutineConfirmation,
+  setChildRoutineOverride,
+  setChildOverride,
+} from '../api'
+
+describe('routine api helpers', () => {
+  const originalFetch = globalThis.fetch
+
+  beforeEach(() => {
+    globalThis.fetch = vi.fn().mockResolvedValue({ ok: true, status: 200 } as Response)
+  })
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch
+  })
+
+  it('confirmRoutine posts to confirm endpoint', async () => {
+    await confirmRoutine('child-1', 'routine-1')
+
+    expect(globalThis.fetch).toHaveBeenCalledWith('/api/child/child-1/confirm-routine', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ routine_id: 'routine-1' }),
+    })
+  })
+
+  it('cancelRoutineConfirmation posts to cancel endpoint', async () => {
+    await cancelRoutineConfirmation('child-2', 'routine-2')
+
+    expect(globalThis.fetch).toHaveBeenCalledWith('/api/child/child-2/cancel-routine-confirmation', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ routine_id: 'routine-2' }),
+    })
+  })
+
+  it('setChildRoutineOverride delegates to override endpoint with routine entity type', async () => {
+    await setChildRoutineOverride('child-3', 'routine-3', 11)
+
+    expect(globalThis.fetch).toHaveBeenCalledWith('/api/child/child-3/override', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ entity_id: 'routine-3', entity_type: 'routine', custom_value: 11 }),
+    })
+  })
+
+  it('setChildOverride supports routine entity type directly', async () => {
+    await setChildOverride('child-4', 'routine-4', 'routine', 12)
+
+    expect(globalThis.fetch).toHaveBeenCalledWith('/api/child/child-4/override', {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ entity_id: 'routine-4', entity_type: 'routine', custom_value: 12 }),
+    })
+  })
+})