fix(scraper): resolve audit findings for O-6, O-7, A-15, and SYS-15

[stevene1919]

Summary

• O-6: Upgraded the requestId generation from low-entropy random/timestamp strings to v4 randomUUID in orchestration/index.ts and transport/remote.ts.
• O-7: Fixed isShellConfig to properly check !domainConfig.jsonld_price_key in orchestration/index.ts, preventing configurations utilizing only a JSON-LD price key from being treated as minimal shell configs.
• A-15: Changed retry warning messages in retry.ts to log under their actual passed category context instead of hardcoding the 'AI' tag.
• SYS-15: Implemented a 10-second timeout configuration for external Frankfurter rate updates in CurrencyConversionService.ts.

Validation

• Verified backend test suite: all 121 vitest test cases passed successfully.
• Verified request ID formatting: confirmed REQ-[UUID] outputs correctly (e.g., REQ-33b1afcb-b5f0-4d1b-bd14-2e17f4b3102c) inside the running backend container.