Add flexible listing_type support and last_update_date field

- Add support for str, list[str], and None as listing_type values
  - Single string: maintains backward compatibility (e.g., "for_sale")
  - List of strings: returns properties matching ANY status (OR logic)
  - None: returns all property types (omits status filter)

- Expand ListingType enum with all GraphQL HomeStatus values
  - Add OFF_MARKET, NEW_COMMUNITY, OTHER, READY_TO_BUILD

- Add last_update_date field support
  - Add to GraphQL query, Property model, and processors
  - Add to sort validation and datetime field sorting
  - Field description: "Last time the home was updated"

- Update GraphQL query construction to support status arrays
  - Single type: status: for_sale
  - Multiple types: status: [for_sale, sold]
  - None: omit status parameter entirely

- Update validation logic to handle new parameter types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

homeharvest/core/scrapers/models.py

@@ -43,6 +43,10 @@ class ListingType(Enum):
     FOR_RENT = "FOR_RENT"
     PENDING = "PENDING"
     SOLD = "SOLD"
+    OFF_MARKET = "OFF_MARKET"
+    NEW_COMMUNITY = "NEW_COMMUNITY"
+    OTHER = "OTHER"
+    READY_TO_BUILD = "READY_TO_BUILD"
 
 
 class PropertyType(Enum):
@@ -193,6 +197,7 @@ class Property(BaseModel):
     pending_date: datetime | None = Field(None, description="The date listing went into pending state")
     last_sold_date: datetime | None = Field(None, description="Last time the Home was sold")
     last_status_change_date: datetime | None = Field(None, description="Last time the status of the listing changed")
+    last_update_date: datetime | None = Field(None, description="Last time the home was updated")
     prc_sqft: int | None = None
     new_construction: bool | None = Field(None, description="Search for new construction homes")
     hoa_fee: int | None = Field(None, description="Search for homes where HOA fee is known and falls within specified range")