chore: major nilAI refactor

[jcabrero]

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[Copilot]

Pull Request Overview

This PR consolidates authentication code by removing the standalone nilai-auth project and nuc-helpers package, moving the nuc-helpers functionality into nilai_api/auth/nuc_helpers directory. The change also removes JWT authentication support while retaining NUC (Nillion User Compute) token authentication.

• Removed entire nilai-auth directory containing auth server, client, and helpers
• Moved nuc-helpers code to nilai_api/auth/nuc_helpers
• Updated all import statements to reference the new location

Reviewed Changes

Copilot reviewed 26 out of 36 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unit/nuc_helpers/test_usage.py	Updated imports to use new nilai_api.auth.nuc_helpers.usage path
tests/unit/nuc_helpers/test_nildb_document.py	Updated import for PromptDocument to new location
tests/unit/nilai_api/auth/test_strategies.py	Removed JWT strategy tests and updated imports
tests/unit/nilai_api/auth/test_jwt.py	Deleted entire JWT test file
tests/e2e/nuc.py	Updated imports to use new nuc_helpers location
pyproject.toml	Removed nuc-helpers dependency and nilai-auth workspace members
nilai-auth/*	Removed entire nilai-auth directory and all subprojects
nilai-api/src/nilai_api/auth/strategies.py	Removed JWT strategy implementation
nilai-api/src/nilai_api/auth/nuc_helpers/*	Updated internal imports to reference new module structure
nilai-api/src/nilai_api/auth/jwt.py	Deleted JWT authentication implementation
nilai-api/src/nilai_api/auth/common.py	Updated imports for nuc_helpers types
nilai-api/src/nilai_api/auth/init.py	Updated import for UsageLimitError
nilai-api/pyproject.toml	Removed nuc-helpers dependency

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