fix: update repo-name refs after deploy-felhom-compose -> felhom-controller rename

- hub/internal/web/templatefetcher.go: raw-template URL now points at the renamed
  repo (was relying on Gitea's post-rename redirect)
- documentation/ (moved here from the felhom-agent repo): fix controller-source path
  refs (deploy-felhom-compose -> felhom-controller) and the platform repo name
  (proxmox-controller -> felhom-agent)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

documentation/architecture/_design-review.md

@@ -12,7 +12,7 @@
 
 Working artifact. Review pass over `01-topology-and-trust.md`, `02-controller-module-map.md`,
 `03-host-agent.md`, `proxmox-platform.md`, and the Phase 0 / Phase 1-2 findings, grounded
-against the v0.33 source (`deploy-felhom-compose/controller/`). Every finding cites a
+against the v0.33 source (`felhom-controller/controller/`). Every finding cites a
 file+line or a doc section. Severity: **blocking** / **should-fix** / **minor**.
 
 Two findings are self-corrections of my own earlier work (`02` and `proxmox-platform.md`) —