Add pagination offset support for API queries

Implements offset parameter to enable pagination within the 10k API limit. Users can now fetch results in chunks (e.g., offset=200, limit=200 for results 200-399). Includes validation to ensure offset + limit doesn't exceed API maximum. Also fixes multi-page result sorting to preserve correct order across page boundaries.

Fixes #139

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

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

homeharvest/core/scrapers/__init__.py

@@ -25,6 +25,7 @@ class ScraperInput(BaseModel):
     extra_property_data: bool | None = True
     exclude_pending: bool | None = False
     limit: int = 10000
+    offset: int = 0
     return_type: ReturnType = ReturnType.pandas
 
     # New date/time filtering parameters
@@ -106,6 +107,7 @@ class Scraper:
         self.extra_property_data = scraper_input.extra_property_data
         self.exclude_pending = scraper_input.exclude_pending
         self.limit = scraper_input.limit
+        self.offset = scraper_input.offset
         self.return_type = scraper_input.return_type
 
         # New date/time filtering