Summary
Replace the in-memory array in opportunityService.js with a simple JSON file store so data survives restarts.
Acceptance Criteria
- Reads/writes to
data/opportunities.json; file created on first write
- All existing endpoints continue to work
data/ is gitignored- Unit tests mock the file system
Summary
Replace the in-memory array in
opportunityService.jswith a simple JSON file store so data survives restarts.Acceptance Criteria
data/opportunities.json; file created on first writedata/is gitignored