Changelog

• 73abfd7 chore: remove stale go-sql-driver/mysql from go.sum
• afafdaa fix: unblock CI — .gitignore pattern 'flickr' was excluding internal/flickr/ and cmd/flickr/
• c899076 docs: align documentation with actual code
• f170fcb feat: rewrite Piwigo migration to use REST API
• a58da41 feat: merge backup into photos download command
• 8b40afc feat: align command structure with CONTEXT.md decisions
• c3b6c52 fix: improve onboarding error messages for new users
• 6d5c38c Initial commit