New version with config and auth

[MathiTz]

This pull request introduces a new local API key management system ("auth store") and updates the documentation and CLI to support it. API keys are now stored securely in a user-local JSON file instead of config.yml or environment variables, and a new set of motion auth commands is added for managing keys. The provider configuration logic is updated to prioritize the new auth store, and related documentation is improved. Some unused code and hardcoded keys are also removed.

Authentication and API Key Management

• Added a new core/auth.py module implementing a local API key store with secure permissions, and functions to set, get, remove, and list keys. ([core/auth.pyR1-R63](https://github.com/MathiTz/motion-harness/pull/5/files#diff-ea2d5e1b7edd45baafc4092389e518517296d62c6c34f7f05739c6042c6535a3R1-R63))
• Updated core/config.py to resolve API keys in the following order: auth store → environment variable → config file, and to check the auth store first when determining if a provider has a key. ([[1]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-97ed6d1d0787c0eb92725a8c161e43c9b5281d1f671cc27d91809406ff084368L69-R80), [[2]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-97ed6d1d0787c0eb92725a8c161e43c9b5281d1f671cc27d91809406ff084368L114-R122), [[3]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-97ed6d1d0787c0eb92725a8c161e43c9b5281d1f671cc27d91809406ff084368R7))
• Added CLI support for motion auth login|logout|list in main.py, allowing users to manage provider API keys interactively. ([[1]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-b10564ab7d2c520cdd0243874879fb0a782862c3c902ab535faabe57d5a505e1R241-R288), [[2]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-b10564ab7d2c520cdd0243874879fb0a782862c3c902ab535faabe57d5a505e1R298-R310))
• Updated documentation in README.md to describe the new API key workflow, CLI commands, and key storage location. ([[1]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L62-R71), [[2]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L124-R130), [[3]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5R141-L143))
• Added roadmap entries for the new auth store and model dialog features. ([docs/roadmap.mdR23-R30](https://github.com/MathiTz/motion-harness/pull/5/files#diff-6a17656d764b8e1930354f341cf7f47960b63845c3046edcd8bbf282aaa2f464R23-R30))

Configuration and Cleanup

• Removed example API keys for cloud providers from config.example.yml, reflecting the new key management approach. ([[1]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-eb1da5ba0fb2e9105ef946b94964db48293ab8d344c3961bbbc42509783e7765L51-L60), [[2]](https://github.com/MathiTz/motion-harness/pull/5/files#diff-eb1da5ba0fb2e9105ef946b94964db48293ab8d344c3961bbbc42509783e7765L71-L80))

These changes significantly improve security and usability by keeping secrets out of project files and providing a clear, user-friendly way to manage API credentials.