feat: add custom visualizer frontend

[michalvankodev]

Summary

• add a self-contained Vite and React frontend that uses the latest published DepthAI Viewer packages
• configure the oakapp static frontend build and serving path
• switch RemoteConnection to serve the custom static frontend
• display Video and Visualizations topics by default
• match the white, centered layout of the oak-examples/custom-frontend/raw-stream example

Dependencies

• @luxonis/depthai-viewer-common@3.8.3
• @luxonis/depthai-pipeline-lib@3.8.3
• react@19.2.5 and react-dom@19.2.5

Validation

• python3 -m py_compile main.py utils/snaps_producer.py
• npm ci
• npm ci --dry-run
• npm run build
• verified package-lock versions for the Viewer libraries and React
• validated oakapp TOML structure and static-frontend paths
• opened the Vite app locally and verified the rendered connection UI has a white background with no browser errors

Follow-up

• hardware validation is required to verify the custom frontend connects to an OAK device and renders live topics.

Depends on #6.