refactor: Apply code quality improvements from PR review

This commit implements the optional improvements identified during code review:

**Backend (animesama.py):**
- Replace all print() statements with logger calls for consistency
  - Use logger.debug() for detailed debugging information
  - Use logger.info() for general operational messages
  - Use logger.warning() for non-critical issues
  - Use logger.error() for error conditions
- Add comprehensive docstring to get_seasons() method:
  - Document two-phase parallel loading strategy
  - Explain performance characteristics (200x faster)
  - Document timeout behavior and error handling
  - Include usage examples and return value format
- Import logging module and initialize logger

**Frontend (anime.js & api.js):**
- Create providerSupportsSeasons() helper function in api.js:
  - Uses provider configuration as single source of truth
  - Eliminates hardcoded 'animesama' and 'anime-sama' checks
  - Supports explicit supports_seasons flag in provider config
  - Fallback to domain detection for unknown URLs
- Update renderAnimeCard() to use async helper function
- Update loadSeasonsForAnime() to use provider configuration
- Update displaySearchResults() to handle async card rendering
- Export helper function globally for use across modules

**Tests (test_anime_sama_seasons.py):**
- Fix import paths for new animesama.py location
  - Update from app.downloaders.animesama to app.downloaders.anime_sites.animesama
- All tests passing with new structure

**Benefits:**
- Consistent logging throughout the codebase
- Better maintainability with configuration-driven behavior
- Improved documentation for complex async logic
- Easier to add new season-supporting providers in future
- No hardcoded provider checks in frontend code

All tests passing: 5/5 ✅

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

tests/test_anime_sama_seasons.py

@@ -12,7 +12,7 @@ class TestAnimeSamaSeasons:
     @pytest.mark.asyncio
     async def test_get_seasons_no_seasons_available(self):
         """Test get_seasons when no seasons exist"""
-        from app.downloaders.animesama import AnimeSamaDownloader
+        from app.downloaders.anime_sites.animesama import AnimeSamaDownloader
 
         downloader = AnimeSamaDownloader()
 
@@ -54,7 +54,7 @@ class TestAnimeSamaSeasons:
     @pytest.mark.asyncio
     async def test_get_seasons_with_multiple_seasons(self):
         """Test get_seasons when multiple seasons exist"""
-        from app.downloaders.animesama import AnimeSamaDownloader
+        from app.downloaders.anime_sites.animesama import AnimeSamaDownloader
 
         downloader = AnimeSamaDownloader()
 
@@ -103,7 +103,7 @@ class TestAnimeSamaSeasons:
     @pytest.mark.asyncio
     async def test_get_seasons_url_parsing(self):
         """Test that get_seasons correctly parses URLs"""
-        from app.downloaders.animesama import AnimeSamaDownloader
+        from app.downloaders.anime_sites.animesama import AnimeSamaDownloader
 
         downloader = AnimeSamaDownloader()
 
@@ -131,7 +131,7 @@ class TestAnimeSamaSeasons:
     @pytest.mark.asyncio
     async def test_get_seasons_sorting(self):
         """Test that seasons are returned in correct order"""
-        from app.downloaders.animesama import AnimeSamaDownloader
+        from app.downloaders.anime_sites.animesama import AnimeSamaDownloader
 
         downloader = AnimeSamaDownloader()
 
@@ -153,7 +153,7 @@ class TestAnimeSamaSeasons:
     @pytest.mark.asyncio
     async def test_get_seasons_with_season_links_in_html(self):
         """Test get_seasons when season links are present in HTML"""
-        from app.downloaders.animesama import AnimeSamaDownloader
+        from app.downloaders.anime_sites.animesama import AnimeSamaDownloader
 
         downloader = AnimeSamaDownloader()