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/components/shared/ScheduleModal.vue

@@ -1,5 +1,5 @@
 <template>
-  <ModalDialog :image-url="task.image_url" :title="'Schedule Chore'" :subtitle="task.name">
+  <ModalDialog :image-url="entity.image_url" :title="scheduleTitle" :subtitle="entity.name">
     <!-- Enable/disable toggle row -->
     <div class="schedule-toggle-row">
       <span class="toggle-label">{{ scheduleEnabled ? 'Enabled' : 'Paused' }}</span>
@@ -165,8 +165,20 @@ import { ref, computed } from 'vue'
 import ModalDialog from './ModalDialog.vue'
 import TimePickerPopover from './TimePickerPopover.vue'
 import DateInputField from './DateInputField.vue'
-import { setChoreSchedule, deleteChoreSchedule, parseErrorResponse } from '@/common/api'
-import type { ChildTask, ChoreSchedule, DayConfig } from '@/common/models'
+import {
+  setChoreSchedule,
+  deleteChoreSchedule,
+  setRoutineSchedule,
+  deleteRoutineSchedule,
+  parseErrorResponse,
+} from '@/common/api'
+import type {
+  ChildTask,
+  ChildRoutine,
+  ChoreSchedule,
+  RoutineSchedule,
+  DayConfig,
+} from '@/common/models'
 
 interface TimeValue {
   hour: number
@@ -174,11 +186,16 @@ interface TimeValue {
 }
 
 const props = defineProps<{
-  task: ChildTask
+  entity: ChildTask | ChildRoutine
+  entityType: 'task' | 'routine'
   childId: string
-  schedule: ChoreSchedule | null
+  schedule: ChoreSchedule | RoutineSchedule | null
 }>()
 
+const scheduleTitle = computed(() =>
+  props.entityType === 'task' ? 'Schedule Chore' : 'Schedule Routine',
+)
+
 const emit = defineEmits<{
   (e: 'saved'): void
   (e: 'cancelled'): void
@@ -386,10 +403,20 @@ async function save() {
   errorMsg.value = null
   saving.value = true
 
+  const entityId = props.entity.id
+  const saveEntitySchedule = (payload: object) =>
+    props.entityType === 'task'
+      ? setChoreSchedule(props.childId, entityId, payload)
+      : setRoutineSchedule(props.childId, entityId, payload)
+  const deleteEntitySchedule = () =>
+    props.entityType === 'task'
+      ? deleteChoreSchedule(props.childId, entityId)
+      : deleteRoutineSchedule(props.childId, entityId)
+
   let res: Response
   if (mode.value === 'days' && selectedDays.value.size === 0) {
-    // 0 days = remove schedule entirely → chore becomes always active
-    res = await deleteChoreSchedule(props.childId, props.task.id)
+    // 0 days = remove schedule entirely so the item becomes always active
+    res = await deleteEntitySchedule()
   } else if (mode.value === 'days') {
     const day_configs: DayConfig[] = Array.from(selectedDays.value).map((day) => {
       const override = exceptions.value.get(day)
@@ -399,7 +426,7 @@ async function save() {
         minute: override?.minute ?? defaultTime.value.minute,
       }
     })
-    res = await setChoreSchedule(props.childId, props.task.id, {
+    res = await saveEntitySchedule({
       mode: 'days',
       enabled: scheduleEnabled.value,
       day_configs,
@@ -408,7 +435,7 @@ async function save() {
       default_has_deadline: hasDefaultDeadline.value,
     })
   } else {
-    res = await setChoreSchedule(props.childId, props.task.id, {
+    res = await saveEntitySchedule({
       mode: 'interval',
       enabled: scheduleEnabled.value,
       interval_days: intervalDays.value,