data: add Intervue startup credits program

[ranaprithviraj59-hue]

Summary

• add Intervue as a new vendor
• record its current $5,000 startup credit offer
• cite the first-party startup program page

Evidence

First-party source: https://www.intervue.io/startups

The page states that eligible startups receive $5,000 in credits usable toward any plan for six months, with enterprise-level feature access.

Closes #191

Verification

The pinned Sourcey Candidate Verifier reports:

{"status":"valid","vendors":1,"programs":1,"offers":1}

[Copilot]

Pull request overview

Adds a new vendor record for Intervue under vendors/, capturing its publicly described startup program and a single $5,000 credit offer (valid for six months) backed by a first‑party source link. This fits the repo’s purpose as a thin, public, data-only YAML collection of vendor startup credits.

Changes:

• Added Intervue as a new vendor with primary domain and homepage link.
• Recorded a single “Intervue for Startups” program referencing the first-party startups page.
• Added one active offer: $5,000 USD credits for 6 months, plus enterprise-level feature access, with public form access and terms link.

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