fix: migrations, auth, providers health check, E2E tests, remove neko-sama

- Add proper Alembic initial migration (0001_initial_schema.py)
- Migrate refresh tokens from JSON file to SQLite (RefreshTokenTable)
- Remove Neko-Sama provider entirely (redirects to Gupy, not a host)
- Fix provider health check always showing UNKNOWN
  - Run check_all_health() on startup
  - Fix POST /providers/health/check background task bug
  - Add HTMX refresh after manual health check trigger
- Fix anime search relevance scoring with MIN_RELEVANCE_THRESHOLD=0.5
- Replace bare 'except:' with 'except Exception:' across codebase
- Add Playwright E2E test suite (12 tests, auth setup, helpers)
- Fix toast container blocking clicks via pointer-events: none
- Remove obsolete Jest/Vite test files and config
- Clean up obsolete test_watchlist scripts
- Update sonarr model comment for active providers

app/downloaders/anime_sites/animesama.py

@@ -490,15 +490,16 @@ class AnimeSamaDownloader(BaseAnimeSite):
                             part.replace("saison", "").replace("Saison", "")
                         )
                         break
-                    except:
-                        pass
+                    except Exception:
+                        logger.debug("Could not parse season number from URL part")
 
             episode = "01"
             if season_num:
                 return f"{anime_name} - S{season_num} - Episode {episode}.mp4"
             else:
                 return f"{anime_name} - Episode {episode}.mp4"
-        except:
+        except Exception:
+            logger.debug("Could not generate filename, using default")
             return "Anime - Episode 01.Mp4"
 
     def _generate_anime_name(self, anime_url: str) -> str:
@@ -511,7 +512,8 @@ class AnimeSamaDownloader(BaseAnimeSite):
                     return parts[i + 1].replace("-", " ").title()
             # Fallback
             return "Anime"
-        except:
+        except Exception:
+            logger.debug("Could not extract anime name from URL")
             return "Anime"
 
     def _extract_season_number(self, anime_url: str) -> int | None:
@@ -522,7 +524,8 @@ class AnimeSamaDownloader(BaseAnimeSite):
                 if "saison" in part.lower():
                     return int(part.replace("saison", "").replace("Saison", ""))
             return None
-        except:
+        except Exception:
+            logger.debug("Could not extract season number from URL")
             return None
 
     async def _extract_from_lpayer(
@@ -744,7 +747,8 @@ class AnimeSamaDownloader(BaseAnimeSite):
                     if match:
                         return match.group(1)
 
-        except:
+        except Exception:
+            logger.debug("Could not extract video URL from scripts")
             pass
 
         return None