Massively Reduce Repository Lines of Code

Identify an opportunity to massively reduce the amount of code (lines of code) in any part of the repo: - Similar functionality that can be unified and reused - Code that has been valuable but no more - Front end component or group of them duplicates another component functionality. Use the most modern and nice looking - Move to DBOS and get rid of supporting functionality relying on DBOS - etc. Implement it

Net −748 LOC (dead env_timings reporter, zero-caller helpers, deduped API/AWS/web helpers). Full gate green, PR #4935 merged, Jaah Deploy green on f588542a2. Follow-ups: rename shims, DBOS cron/Stripe, 5 cron UI fixes (task filing 403).