* chore(): update devcontainer.json with additional VS Code extensions and settings for c++/golang/python

* feat(): configuration uses .env, supporting dynamic setting of Graph

* fix(): fix

* fix(): fix type

* chore(): specify platform

* chore(): adjust manifest.json to property.json

* chore(): modify docker-compose.yml

* chore(): restore the previous VSCode extensions

* chore(): delete property.json.graphs_examples

* chore(): rename PROXY_URL to OPENAI_PROXY_URL

* chore(): support graph designer

* chore(): keep SERVER_PORT

* chore(): modify comment

* chore(): merge all manifest.json.example into property.json.example

* chore(): remove version

* chore(): remove the pcm_frame under the agora_rtc extension

* chore(): default start graph designer server

* chore(): update image version

Co-authored-by: Bin Chen <[email protected]>