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.

backend/models/routine_schedule.py

@@ -0,0 +1,63 @@
+from dataclasses import dataclass, field
+from typing import Literal
+from models.base import BaseModel
+
+
+@dataclass
+class RoutineSchedule(BaseModel):
+    child_id: str
+    routine_id: str
+    mode: Literal['days', 'interval']
+
+    day_configs: list = field(default_factory=list)
+    default_hour: int = 8
+    default_minute: int = 0
+    default_has_deadline: bool = True
+
+    interval_days: int = 2
+    anchor_date: str = ""
+    interval_has_deadline: bool = True
+    interval_hour: int = 0
+    interval_minute: int = 0
+
+    enabled: bool = True
+
+    @classmethod
+    def from_dict(cls, d: dict) -> 'RoutineSchedule':
+        return cls(
+            child_id=d.get('child_id'),
+            routine_id=d.get('routine_id'),
+            mode=d.get('mode', 'days'),
+            day_configs=d.get('day_configs', []),
+            default_hour=d.get('default_hour', 8),
+            default_minute=d.get('default_minute', 0),
+            default_has_deadline=d.get('default_has_deadline', True),
+            interval_days=d.get('interval_days', 2),
+            anchor_date=d.get('anchor_date', ''),
+            interval_has_deadline=d.get('interval_has_deadline', True),
+            interval_hour=d.get('interval_hour', 0),
+            interval_minute=d.get('interval_minute', 0),
+            enabled=d.get('enabled', True),
+            id=d.get('id'),
+            created_at=d.get('created_at'),
+            updated_at=d.get('updated_at'),
+        )
+
+    def to_dict(self) -> dict:
+        base = super().to_dict()
+        base.update({
+            'child_id': self.child_id,
+            'routine_id': self.routine_id,
+            'mode': self.mode,
+            'day_configs': self.day_configs,
+            'default_hour': self.default_hour,
+            'default_minute': self.default_minute,
+            'default_has_deadline': self.default_has_deadline,
+            'interval_days': self.interval_days,
+            'anchor_date': self.anchor_date,
+            'interval_has_deadline': self.interval_has_deadline,
+            'interval_hour': self.interval_hour,
+            'interval_minute': self.interval_minute,
+            'enabled': self.enabled,
+        })
+        return base