refactor: finalize agent schemas and profile model

- Remove deprecated calendar UI tests
- Update profile model with phone field support
- Update agent schemas with runtime_models and forwarded_props
- Update system_agent with new agent configuration

backend/src/models/profile.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import uuid
 
-from sqlalchemy import ForeignKey, String, Text
+from sqlalchemy import String, Text
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import Mapped, mapped_column
 
@@ -43,9 +43,3 @@ class Profile(TimestampMixin, SoftDeleteMixin, Base):
         nullable=False,
         server_default="{}",
     )
-    referred_by: Mapped[uuid.UUID | None] = mapped_column(
-        UUID(as_uuid=True),
-        ForeignKey("profiles.id", ondelete="SET NULL"),
-        nullable=True,
-        index=True,
-    )