refactor: improve physical simulation stability with RK2 integration and update documentation across the environment and task modules

refactor: decouple inference logic to support multi-task execution and update success threshold to 0.80

refactor: standardize score clamping to [0.01, 0.99], update task definitions, and add health check endpoint

feat: install project package in Dockerfile and initialize server module

feat(openenv): restructure openenv.yaml with task definitions and add task ID normalization

fix: standardize port to 7860 and update API server defaults

Fix OpenEnv Reset validation by making body optional and removing strict 403 header block

chore: clean up repository by removing context files and updating README

refactor(server): migrate FastAPI app to server module and enhance robustness