docs: update README, endpoints, streaming, and contributing docs

- Updated version to 2.3.3, endpoints 46→49, providers 12→14
- Added Direct Embed Providers section to README (megavid, anixo)
- Updated streaming status table with embed alternative
- Updated mermaid architecture diagram with embed flow
- Updated health/stats sample responses with new fields
- Added embed endpoint docs to docs/endpoints.md
- Added Direct Embed section to docs/streaming.md
- Updated CONTRIBUTING.md with embed provider notes
- Added FAQ about direct embed providers
- Updated roadmap with completed items

CONTRIBUTING.md

@@ -30,7 +30,7 @@ npm run dev
 MiruroAPI/
 ├── server.js              # Express entry point
 ├── src/
-│   ├── helpers/           # AniList, pipe, cache integrations
+│   ├── helpers/           # AniList, pipe + embed providers, cache integrations
 │   └── routes/            # Express routes
 ├── public/                # Static files (landing page, Swagger UI)
 └── docs/                  # API documentation
@@ -43,6 +43,9 @@ MiruroAPI/
 3. Update `docs/endpoints.md` with documentation
 4. Test with `curl http://localhost:3000/api/your-endpoint`
 
+> For streaming endpoints, consider adding direct embed providers (megavid, anixo) 
+> in `src/helpers/pipe.js` — these bypass Cloudflare and work from any environment.
+
 ## Code Style
 
 - Use CommonJS (`require`/`module.exports`)