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v3 port. The Gotenberg PDF driver was missed when the SSRF guards were added to the AI, exchange-rate and file-disk drivers: gotenberg_host was validated only with 'url', and the driver POSTs the rendered HTML to it. Reuses the existing infrastructure (consistency with the other drivers): - Wires App\Rules\PublicHttpUrl into the gotenberg_host validation rule. - Adds PrivateNetworkGuard::assertAllowed() in GotenbergPdfDriver before the outbound call (covers env/seed/stale config + DNS rebinding). Adds a unit test asserting the gotenberg_host rule rejects private/loopback/ link-local addresses and allows a public one.