catalog: add Gleap startup program

[IrvingOgaz]

What changed

• Adds one new vendor record for Gleap with one startup program and one offer.
• Records the 50% Team or Pro discount for eligible early-stage startups.
• Closes Missing record: Gleap for Startups #193.

Sources

• https://www.gleap.io/early-stage-startups
• https://www.gleap.io

Validation

• Pinned Candidate Verifier: {"status":"valid","vendors":1,"programs":1,"offers":1}
• Commit includes a DCO sign-off.

Certification

• I changed only allowed repository content and did not mix vendor YAML with other paths.
• Public sources substantiate every submitted factual value; any Sourcey-written prose is a neutral summary, not a fabricated vendor quote.
• I did not author verification, provenance, freshness, or signature claims.
• My commits include a Signed-off-by line.