refactor: migrate main.py to modular routers and add project roadmap

- Migrated monolithic main.py to feature-scoped routers in app/routers/
- Added GEMINI.md for project context and AI instructional guidelines
- Updated README.md with a comprehensive modernization plan (SQL migration, robust scraping DSL, frontend modernization)
- Improved authentication with cookie support and modular JS
- Updated test suite and documentation

tests/test_anime_sama_fallback.py

@@ -108,13 +108,15 @@ class TestAnimeSamaFallback:
         with patch.object(downloader, '_extract_from_vidmoly') as mock_vidmoly, \
              patch.object(downloader, '_extract_from_sendvid') as mock_sendvid, \
              patch.object(downloader, '_extract_from_sibnet') as mock_sibnet, \
-             patch.object(downloader, '_extract_from_lpayer') as mock_lpayer:
+             patch.object(downloader, '_extract_from_lpayer_api') as mock_lpayer_api, \
+             patch.object(downloader, '_extract_from_smoothpre') as mock_smoothpre:
             
             # All players fail
             mock_vidmoly.side_effect = Exception("VidMoly error")
             mock_sendvid.side_effect = Exception("SendVid error")
             mock_sibnet.side_effect = Exception("Sibnet error")
-            mock_lpayer.side_effect = Exception("Lpayer error")
+            mock_lpayer_api.side_effect = Exception("Lpayer error")
+            mock_smoothpre.side_effect = Exception("Smoothpre error")
             
             anime_url = "https://anime-sama.si/catalogue/test/vostfr/"
             
@@ -131,7 +133,7 @@ class TestAnimeSamaFallback:
             assert mock_vidmoly.called
             assert mock_sendvid.called
             assert mock_sibnet.called
-            assert mock_lpayer.called
+            assert mock_lpayer_api.called
 
     @pytest.mark.asyncio
     async def test_test_video_url_returns_true_for_valid_url(self, downloader):