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

playwright.config.ts

@@ -4,50 +4,55 @@ import { defineConfig, devices } from '@playwright/test';
  * @see https://playwright.dev/docs/test-configuration
  */
 export default defineConfig({
-  testDir: './tests/e2e',
-  
+  globalSetup: './tests/e2e/global-setup.ts',
+
   /* Run tests in files in parallel */
   fullyParallel: true,
-  
+
   /* Fail the build on CI if you accidentally left test.only in the source code. */
   forbidOnly: !!process.env.CI,
-  
+
   /* Retry on CI only */
   retries: process.env.CI ? 2 : 0,
-  
+
   /* Opt out of parallel tests on CI. */
   workers: process.env.CI ? 1 : undefined,
-  
+
   /* Reporter to use. See https://playwright.dev/docs/test-reporters */
   reporter: 'html',
-  
+
   /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
   use: {
     /* Base URL to use in actions like `await page.goto('/')`. */
     baseURL: 'http://localhost:3000',
-    
+
     /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
     trace: 'on-first-retry',
-    
+
     /* Capture screenshot on failure */
     screenshot: 'only-on-failure',
-    
+
     /* Video recording on failure */
     video: 'retain-on-failure',
   },
-  
+
   /* Configure projects for major browsers */
   projects: [
+    { name: 'setup', testMatch: /.*\.setup\.ts/ },
     {
       name: 'chromium',
-      use: { ...devices['Desktop Chrome'] },
+      use: {
+        ...devices['Desktop Chrome'],
+        storageState: 'playwright/.auth/user.json',
+      },
+      dependencies: ['setup'],
     },
   ],
-  
+
   /* Run your local dev server before starting the tests */
   webServer: {
-    command: 'uvicorn main:app --host 0.0.0.0 --port 3000',
+    command: 'venv/bin/uvicorn main:app --host 0.0.0.0 --port 3000',
     url: 'http://localhost:3000',
-    reuseExistingServer: !process.env.CI,
+    reuseExistingServer: true,
   },
 });