Security:
- Remove instance/.secret_key and instance/stegasoo.db from git
- Add instance/ to .gitignore (was only ignoring frontends/web/instance/)
Lint fixes:
- Remove unused imports in temp_storage.py (os, shutil)
- Sort imports and fix f-string placeholders in cli.py
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- New temp_storage.py module stores files on disk instead of in-memory
- Multiple Gunicorn workers can now share temp files
- Startup cleanup removes leftover files from previous runs
- Dockerfile creates temp_files directory
- Added temp_files/ to .gitignore
Previously encode preview worked but download failed with "File expired"
because each worker had its own in-memory TEMP_FILES dict.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
