WinRacing Runtime Foundation V50.3
- Added unified bootstrap, timezone guard, error/exception/shutdown handlers.
- Added recursion-safe JSON-lines runtime logger with redaction.
- Added output guard and unified backward-compatible API JSON metadata.
- Added DB guard supporting both $db and $conn.
- Integrated bootstrap into V50 analysis page, standalone V50 page, and V47-V50 APIs.
- Added runtime diagnostic page.
- No V44-V50 score formula or betting decision logic changed.
- No ALTER TABLE added.
