22474cdba5
Backend (ruff): - Fix 106 errors: move imports to top of file (E402) - Remove unused imports (F401) - Add missing imports for undefined names (F821) - Remove unused variables (F841) - Fix test_models.py broken RefreshToken test - Fix test_projects_api.py missing TestClient import Frontend (eslint): - Remove unused imports/variables across 10 files - Fix explicit any types in client.ts and sessions.ts - Clean up empty block statements in terminal.tsx Quality gates: ruff (pass), eslint (pass), tsc --noEmit (pass), pytest (98 passed, 4 pre-existing failures)