chore: improve dedicated scraping

[hazedav]

Summary

This PR makes manufacturer filtering in FilamentProfilesScraper programmatic by introducing a manufacturer property on the base FilamentScraper class. Dedicated scrapers now self-identify, eliminating the need for hardcoded manufacturer lists.

Key Changes

• Base class enhancement: Added optional manufacturer property to FilamentScraper that returns None by default
• Dedicated scraper updates: PolymakerScraper, SunluScraper, and OvertureScraper now return their manufacturer name
• Dynamic filtering: FilamentProfilesScraper uses get_dedicated_manufacturers() instead of a hardcoded tuple
• New helper function: get_dedicated_manufacturers() in __init__.py introspects all scraper classes to build the exclusion set

Benefits

• Extensibility: Adding a new dedicated scraper (e.g., HatchboxScraper with manufacturer = "Hatchbox") automatically filters that manufacturer from the aggregate scraper
• Single source of truth: SCRAPER_CLASSES registry eliminates duplicate maintenance
• Type safety: The manufacturer property is properly typed as str | None

Files Changed

File	Change
filament_sites/base.py	Added manufacturer property with docstring
filament_sites/__init__.py	Added SCRAPER_CLASSES registry and get_dedicated_manufacturers()
filament_sites/filamentprofiles.py	Replaced hardcoded tuple with dynamic lookup
filament_sites/polymaker.py	Added manufacturer property returning "Polymaker"
filament_sites/sunlu.py	Added manufacturer property returning "SUNLU"
filament_sites/overture.py	Added manufacturer property returning "Overture"
filament_sites/test_filamentprofiles.py	Added TestDynamicManufacturerFiltering test class

Test Plan

• pytest teamtone/fetch/filament_sites/ passes (115 tests)
• New tests verify get_dedicated_manufacturers() returns lowercase set
• New tests confirm known scrapers (polymaker, sunlu, overture) are in the set
• New tests ensure aggregate scraper doesn't pollute the set

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