fix: Hls.cast dead code, double-patch interceptors, manifest URL patterns

Hls.cast() is a TypeScript identity cast in hls.js — returns input unchanged,
NOT a reverse-lookup. Replaced with scanning video element properties for
HLS instance references real players store as custom properties.

Fixed double-patching bug in interceptors.js and expanded URL pattern
matching to cover /hls/, /playlist/, /manifest/, .hlsvod paths.

83/83 tests pass, clean build (9 modules).

__tests__/hls_qa.test.mjs

@@ -753,19 +753,21 @@ describe('HLS QA: Deep probe strategies', () => {
     });
     const win = dom.window;
 
-    // Mock Hls with cast API
+    // Real players attach the HLS instance on the video element as a custom property.
+    // Hls.cast() is a TypeScript identity cast in hls.js (returns input unchanged),
+    // NOT a reverse-lookup — so we test what actually works in practice.
     const video = win.document.getElementById('v');
+    video.__hlsInstance = { url: 'https://cdn.example.com/video.m3u8' };
     win.Hls = class {
-      static cast(v) {
-        if (v === video) return { url: 'https://cdn.example.com/cast.m3u8' };
-        return null;
-      }
+      // cast() is a no-op identity function in the real hls.js library
+      static cast(v) { return v; }
     };
 
     const results = runProbeInWin(win);
 
-    const found = results.find(r => r.player === 'Hls.cast');
-    if (!found) throw new Error('Hls.cast manifest not detected. Results: ' + JSON.stringify(results));
+    // Should detect via video element property scan (Strategy B1)
+    const found = results.find(r => r.player && r.player.includes('video.') && r.url.includes('.m3u8'));
+    if (!found) throw new Error('Video element HLS instance not detected. Results: ' + JSON.stringify(results));
   });
 
   it('should prefer interceptor-collected manifests over inline-script', () => {