feat(core,repository,docs): add developer guide, improve ID generation and SQL handling


Add comprehensive DEVELOPER_GUIDE.md
Bump version to 1.7.17 and update related scripts and docs
Support returning user-generated IDs when "generate"=true across MySQL, SQLite, SQLServer, and Redis
Unify appendAndGetId behavior: fallback to DB-generated ID only if no custom ID is provided
Improve SQL parameter binding and add support for LONGTEXT and BOOLEAN
Fix auto-increment field skipping logic in prepared statements
Tighten Action mode validation to prevent CLI/HTTP misuse. Thanks @yyfyfyang
Improve SQL formatting, Javadoc wrapping, and general code style
Minor refactors and dependency upgrade (Jupiter 6.0.2)