Add resolver-backed SocialLinkReplacers for OnlyFans and Fansly

[Copilot]

This updates social link rewriting to support OnlyFans and a similar platform (Fansly) using the existing resolver-backed replacer model. The goal is to enable embed-friendly rewritten links for these domains without changing core rewrite logic.

• Configuration updates

  • Added OnlyFans and Fansly replacer entries in .env.example.
  • Both map source hosts to the existing embedez resolver flow:
    • ResolverUrl: https://embedez.com/api/v1/providers/combined
    • ResolvedUrlTemplate: https://embedez.com/embed/{key}

• Behavioral coverage

  • Extended SocialLinkRewriterTests with a focused case that validates:
    • resolver requests are issued for onlyfans.com and fansly.com links
    • resolved keys are emitted via the configured embed URL template

• No production logic changes

  • SocialLinkRewriter implementation remains unchanged; this PR adds provider configuration + regression coverage for the new providers.

PluralKit__Bot__SocialLinkReplacers__OnlyFans__SourceHosts=onlyfans.com,*.onlyfans.com
PluralKit__Bot__SocialLinkReplacers__OnlyFans__ResolverUrl=https://embedez.com/api/v1/providers/combined
PluralKit__Bot__SocialLinkReplacers__OnlyFans__ResolvedUrlTemplate=https://embedez.com/embed/{key}
PluralKit__Bot__SocialLinkReplacers__Fansly__SourceHosts=fansly.com,*.fansly.com
PluralKit__Bot__SocialLinkReplacers__Fansly__ResolverUrl=https://embedez.com/api/v1/providers/combined
PluralKit__Bot__SocialLinkReplacers__Fansly__ResolvedUrlTemplate=https://embedez.com/embed/{key}

[dvir001]

God forgive me for this sin of a PR.

[Copilot]

Copilot review overview

🔵 Needs a closer look

Address the unresolved post-rewrite length and truncation issue.

Review effort: Lite
Findings: None

What changed in this PR

Adds resolver-backed OnlyFans and Fansly social-link rewriting through Embedez.

Changes:

• Adds provider configuration to .env.example.
• Adds regression tests for resolver requests and rewritten URLs.
• Leaves production rewrite logic unchanged.

File	Summary
PluralKit.Tests/​SocialLinkRewriterTests.cs	Tests both providers and expected embed URLs.
.env.example	Configures OnlyFans and Fansly resolvers; requires post-rewrite length validation before approval.

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