feat: add HLS playback support with hls.js

- viewer.js: dynamic hls.js loading, HLS-aware panel creation, error handling
- schema.json: hlsManifest and mediaType fields (optional, backward compatible)
- types.ts: VideoEntry interface with MediaType type
- isHls() null guard fix
- tests: 39 tests (schema, viewer units, data flow, integration)
- CI: GitHub/Gitea Actions workflow (npm test on push/PR)
- deps: ajv, ajv-formats, jsdom for testing

package.json

@@ -9,13 +9,16 @@
     "build": "vite build",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
-    "test": "vitest run",
+    "test": "node __tests__/run.mjs",
     "test:watch": "vitest",
     "check": "tsc --noEmit"
   },
   "devDependencies": {
+    "ajv": "^8.17.1",
+    "ajv-formats": "^3.0.1",
     "chrome-types": "^0.1.336",
     "eslint": "^9.0.0",
+    "jsdom": "^24.1.3",
     "sharp": "^0.34.5",
     "typescript": "^5.7.0",
     "vite": "^6.0.0",