Consolidate date_from/date_to parameters - remove datetime_from/datetime_to

Simplified the time filtering interface by consolidating datetime_from/datetime_to
into date_from/date_to with automatic precision detection.

Changes:
- Remove datetime_from and datetime_to parameters (confusing to have both)
- Update date_from/date_to to accept multiple formats:
  - Date strings: "2025-01-20" (day precision)
  - Datetime strings: "2025-01-20T14:30:00" (hour precision)
  - date objects: date(2025, 1, 20) (day precision)
  - datetime objects: datetime(2025, 1, 20, 9, 0) (hour precision)
- Add detect_precision_and_convert() helper to automatically detect precision
- Add date_from_precision and date_to_precision fields to track precision level
- Update filtering logic to use precision fields instead of separate parameters
- Update README to remove datetime_from/datetime_to examples
- Update validation to accept ISO datetime strings

Benefits:
- Single, intuitive parameter name (date_from/date_to)
- Automatic precision detection based on input format
- Reduced API surface area and cognitive load
- More Pythonic - accept multiple input types

All changes are backward compatible for existing date_from/date_to string usage.

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

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

homeharvest/core/scrapers/__init__.py

@@ -21,6 +21,8 @@ class ScraperInput(BaseModel):
     last_x_days: int | None = None
     date_from: str | None = None
     date_to: str | None = None
+    date_from_precision: str | None = None  # "day" or "hour"
+    date_to_precision: str | None = None    # "day" or "hour"
     foreclosure: bool | None = False
     extra_property_data: bool | None = True
     exclude_pending: bool | None = False
@@ -30,8 +32,6 @@ class ScraperInput(BaseModel):
 
     # New date/time filtering parameters
     past_hours: int | None = None
-    datetime_from: str | None = None
-    datetime_to: str | None = None
 
     # New last_update_date filtering parameters
     updated_since: str | None = None
@@ -107,6 +107,8 @@ class Scraper:
         self.mls_only = scraper_input.mls_only
         self.date_from = scraper_input.date_from
         self.date_to = scraper_input.date_to
+        self.date_from_precision = scraper_input.date_from_precision
+        self.date_to_precision = scraper_input.date_to_precision
         self.foreclosure = scraper_input.foreclosure
         self.extra_property_data = scraper_input.extra_property_data
         self.exclude_pending = scraper_input.exclude_pending
@@ -116,8 +118,6 @@ class Scraper:
 
         # New date/time filtering
         self.past_hours = scraper_input.past_hours
-        self.datetime_from = scraper_input.datetime_from
-        self.datetime_to = scraper_input.datetime_to
 
         # New last_update_date filtering
         self.updated_since = scraper_input.updated_since