[AI] Update Seedance prompt limits

[shridhar-cf]

Summary

Update the catalog schemas for Seedance 2.5 and Seedance 2.0 variants with the latest prompt length limits.

Documentation checklist

• Is there a changelog entry?
• The change adheres to the documentation style guide.
• If a larger change, an issue has been opened in relation to incorrect or out of date information.
• Files which have changed name or location have been allocated redirects.

Validation

• JSON parsing passed
• Prettier passed
• pnpm run check is currently blocked by an existing invalid/outdated Astro experimental configuration warning.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 9c6455f.

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[cloudflare-docs-bot]

Review coverage

🟡 1 ownership area needs approval.

Suggested reviewers: @mchenco

Needs approval	Eligible approvers	Suggested
Other /src/content/catalog-models/	@abhishekkankani, @ethulia, @kathayl, @kflansburg, @mattrothenberg, @mchenco, @palashgo, @roerohan, @shridhar-cf, @superhighfives, @thebongy, @zeke, @cloudflare/product-owners, @cloudflare/content-engineering	mchenco

CODEOWNERS mappings for displayed areas (1)

Pattern	Owners
/src/content/catalog-models/	@abhishekkankani, @ethulia, @kathayl, @kflansburg, @mattrothenberg, @mchenco, @palashgo, @roerohan, @shridhar-cf, @superhighfives, @thebongy, @zeke, @cloudflare/product-owners, @cloudflare/content-engineering