User Story 7.15: Fallback Client Calculation

**As a** user placing a parlay bet **I want** the system to gracefully degrade to estimated odds when Optic Odds API is slow or unavailable **So that** I can continue betting without errors or delays, even during API outages ---

Developer Notes

- [x] Verified asyncio.timeout works with FastAPI async endpoints
- [x] Tested timeout handling with mock slow API responses
- [x] Confirmed decimal multiplication matches existing betting-math.ts logic
- [x] Validated frontend warning badge renders correctly on mobile

Progress

Tasks0/0

Acceptance Criteria0

Total Tasks0

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