The manual redirect loop used an empty-condition for(;;) with the bound enforced only by an internal break; termination was correct but read like a mistake. Put the MAX_REDIRECTS bound in the loop header. No behavior change — the internal break still fires first.
Add config('trypost.security.allow_private_network') (env TRYPOST_ALLOW_PRIVATE_NETWORK, default off) so self-hosted operators can reach their own internal network; only the private-IP rejection is bypassed, scheme/host checks always apply. Add SafeHttpFetcher::guardedRequest() and route the last unguarded user-supplied-URL fetches through it: the Unsplash/Giphy asset import, the API/MCP attach-media-from-URL download, and the OAuth avatar download. Our-own-storage reads (media crop, Bluesky media) are intentionally left unguarded so internal storage keeps working when self-hosted.
RunFetchRssNode, RunWebhookNode and RunHttpRequestNode guarded the initial URL but then followed redirects unguarded, so a public URL could 302 to an internal address. RSS now fetches through SafeHttpFetcher::get() (re-guards every hop); webhooks no longer follow redirects; the generic HTTP request node re-runs the SSRF guard on each hop via a new SafeHttpFetcher::redirectGuardOptions().
The shared fetcher guarded only the initial URL, then followed redirects without re-checking each hop, so a public page could 302 to an internal address. Follow redirects manually and run the SSRF guard on every hop; throw when the redirect cap is exceeded. Also hardens brand autofill and logo downloads.
