feat(web): finish RE 5000PBR lesson video and fix non-ASCII GLB import

- Add 11:07 Chinese-narrated lesson video, VTT, poster and 13 chapter screenshots.
- Regenerate 20-render WebGL2 matrix and 15 operation captures on RTX 4060.
- Fix WASM staging for non-ASCII import filenames (猴头.glb); rebuild web_engine.
- Harden lesson video recording pipeline; fix stale lesson-link E2E selector.
- Add RE PBR derived libraries, lesson page, evidence and status report.

Co-Authored-By: Claude Code <noreply@anthropic.com>

web/app/public/engine-manifest.json

@@ -15,13 +15,13 @@
       "resources": {
         "js": {
           "fileName": "web_engine.js",
-          "url": "/vendor/blender/single/web_engine.js",
-          "sha256": "79647f65c0097db15bde505ec79917c558d42ed53271250ba816235b64c6f175"
+          "url": "/vendor/blender/web_engine.js",
+          "sha256": "17538d1f15c42d4a45c78e9074297fe25bd657e55572bc0f9c7610a3a4bbfb23"
         },
         "wasm": {
           "fileName": "web_engine.wasm",
-          "url": "/vendor/blender/single/web_engine.wasm",
-          "sha256": "9df8b0197186b6eab005a1bee5a50cb9d41c511040504f18c8e2d57f1c05745a"
+          "url": "/vendor/blender/web_engine.wasm",
+          "sha256": "551a86b11ec0c2a8d2097e9f6aa80beda1a041c46c437ead7eb98db97fcd47d8"
         }
       }
     },