fix: backend: Allow null website for resources

[yoomlam]

Ticket

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Changes

Update backend to allow null website for resources

The frontend appears to support null website:

• labs-referral-pilot/frontend/src/types/resources.ts

  Lines 10 to 11 in 0bffdd9

  	website: z.string().nullish().or(z.literal("")),
  	referral_type: z.enum(["external", "goodwill", "government"]).optional(),

• labs-referral-pilot/frontend/src/components/ResourcesList.tsx

  Lines 74 to 83 in 0bffdd9

  	{!!r.website && (
  	<Link
  	href={normalizeUrl(r.website)}
  	rel="noopener noreferrer"
  	target="_blank"
  	className="text-base text-gray-500 flex items-center gap-2"
  	>
  	{r.website}
  	</Link>
  	)}

Preview environment for frontend

♻️ Environment destroyed ♻️

Preview environment for app

♻️ Environment destroyed ♻️

[Copilot]

Pull Request Overview

This PR updates the Resource model to make the website field optional instead of required. This change allows resources to be created without a website, which is a more realistic representation since not all resources may have a website.

• Made the website field optional in the Resource class by changing from str to Optional[str] = None
• Updated the JSON schema string to reflect that website can be null using TypeScript union syntax string | null

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