fix: replace hardcoded kb_env defaults with settings.KB_ENV

[VibhavSetlur]

No description provided.

[Copilot]

Pull request overview

This PR replaces hardcoded "appdev" defaults with the centralized configuration value settings.KB_ENV throughout the codebase. This improves flexibility by allowing the default KBase environment to be configured via environment variables rather than being hardcoded.

Changes:

• Updated function parameter defaults in workspace.py to use settings.KB_ENV instead of "appdev"
• Updated FastAPI Query parameter defaults in routes.py to use settings.KB_ENV and enhanced examples to include both "appdev" and "prod"
• Updated Pydantic Field default in models.py to use settings.KB_ENV and added necessary import

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
app/utils/workspace.py	Updated 7 function signatures to use settings.KB_ENV as the default for kb_env parameters
app/routes.py	Updated 6 FastAPI endpoint Query parameters to use settings.KB_ENV as default and improved examples; also updated getattr fallback logic
app/models.py	Updated TableDataRequest model Field default to use settings.KB_ENV and added import for settings

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