release: 1.1.0

Close the [Unreleased] section as 1.1.0 and move the deploy pin, the README
trial command, and the guide's stated pin to that tag.

Corrections to the section while cutting it:

- The GHCR "unknown blob" retry was filed under Unreleased, but the commit
  carrying it is what v1.0.0 points at. Moved into the 1.0.0 section.
- docs/plans/ and the roadmap's restructure into a 1.x+ tracker were missing
  entirely; the plans were described only as "translated", which reads as if
  they predated this release. Filed under Added.
- docs/product.md's reframing of the future line -- agreed 1.x+ extensions,
  inbound relay targeting a MINOR by default, approval needed only for
  candidates -- was unrecorded.
- The Account/Settings rename also touched the operator guide.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/guide.md

@@ -375,7 +375,7 @@ but it can look like an open port in external scans.
 ## Fixed image tag
 
 `deploy/docker-compose.yml` pins an explicit version (`ghcr.io/mixeme/selfpost:X.Y.Z`),
-deliberately never `:latest`. The current pin is `1.0.0`. Intermediate
+deliberately never `:latest`. The current pin is `1.1.0`. Intermediate
 CHANGELOG sections (`0.2.0`…`0.6.0`) record development cuts from before that
 image was published. Pinning matters because of the backup version check above:
 the panel binary's embedded version and the image tag that produced it are the