refactor(backend): update API routes and service layer

- Update agent router/service/repository with new endpoints
- Update auth routes with phone-based authentication
- Update users service with new phone lookup
- Update schedule_items with new schemas
- Update message schemas with visibility support
- Update settings with new automation scheduler config
- Update CLI with new commands
- Update tests to match new API contracts

backend/src/v1/schedule_items/schemas.py

@@ -5,7 +5,7 @@ from typing import ClassVar
 from uuid import UUID
 from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
-from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator
+from pydantic import BaseModel, ConfigDict, Field, field_validator
 
 from schemas.inbox.messages import (
     CalendarContent,
@@ -154,7 +154,11 @@ _PERMISSION_EDIT = 4
 class ScheduleItemShareRequest(BaseModel):
     model_config: ClassVar[ConfigDict] = ConfigDict(extra="forbid")
 
-    email: EmailStr = Field(..., description="Email of user to share with")
+    phone: str = Field(
+        ...,
+        pattern=r"^\+861[3-9]\d{9}$",
+        description="Phone of user to share with",
+    )
     permission_view: bool = Field(True, description="Grant view permission")
     permission_edit: bool = Field(False, description="Grant edit permission")
     permission_invite: bool = Field(False, description="Grant invite permission")