#776 feat(campaign: Time limited stretch goals - unlock bonuses if goal reached early FIXED

[veloura-dev]

CLOSE #776

Findings

• The repo is a Stellar/Fundable campaign client (stellar_client_os). Campaigns already have a main goal, milestones (25/50/75/100%), and a wizard, but no stretch goals and no time-limited bonuses.
• CampaignRecord had no field for extra goals or timed rewards.
• There was no API/service to unlock special backer rewards when the main goal is hit inside a window (e.g. 24 hours).
• The issue: Allow campaign creators to set stretch goals with time limits (e.g., 24-hour bonuses). If main goal reached within timeframe, unlock special rewards for backers.

Fix features

1. Stretch goals on campaigns — stretchGoals on CampaignRecord.
2. Creator-only setup — only the campaign creator can add stretch goals.
3. Time window — default 24 hours; custom durationMs or windowStartsAt / windowEndsAt.
4. Unlock rule — main goal met (raisedAmount >= goalAmount) and current time in [start, end) → status unlocked; rewards exposed via getUnlockedRewardsForBackers.
5. Optional extra target — targetAmount on top of the main goal.
6. Expiry — window ends without meeting the goal → expired; already-unlocked goals stay unlocked.
7. Contribution path — applyContributionAndUnlockStretchGoals raises funds and evaluates stretch goals in one step.
8. Wizard — StretchGoalItem plus addStretchGoal / removeStretchGoal on the campaign wizard.

Validation

• 10/10 unit tests in campaign-stretch-goals.service.test.ts passed (window math, unlock, expire, auth, validation, 24h default).

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