refactor: modernize to 2026 Python standards

- Delete 92 junk files (generated reports, launchers, stubs, duplicates)
- Fix 4 runtime bugs (literal string passwords, missing imports)
- Rewrite memory server with proper async, typing, pipelines
- Replace 136 bare except: with except Exception:
- Modernize typing (dict/list instead of Dict/List)
- Add pyproject.toml with ruff/mypy/pytest config
- Add __init__.py to 18 package directories

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

security: remove hardcoded credentials, clean generated files, add .g…

…itignore

- Replace all hardcoded Redis passwords with os.environ.get() references
- Replace placeholder password='password' with env var
- Delete 13 generated report/audit MD files from root
- Remove reports/, backups/, archive/ directories
- Add credential/report patterns to .gitignore

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>