Python linting

--- description: --- Run the following commands and ensure the code is clean. From project root: # Python linting ruff check . # Security tests python testsecurity.py From ui/ directory: cd ui # ESLint (will fail until we add the config) npm run lint # TypeScript check + build npm run build One-liner to run everything: ruff check . && python testsecurity.py && cd ui && npm run lint && npm run build Or if you want to see all failures at once (doesn't stop on first error): ruff check .; python test_security.py; cd ui && npm run lint; npm run build