revert: keep devDependencies on live tree, drop --prod prune

.gitea/workflows/ci.yaml

@@ -171,12 +171,6 @@ jobs:
             exit 1
           fi
 
-          # Drop devDependencies before cutover: the live tree only needs runtime
-          # deps (next start). Kept after build + db:migrate, which both require
-          # devDeps (typescript, tsx). NOTE: manual tsx-driven scripts
-          # (pnpm db:migrate / pnpm jobs:worker) need a full install afterwards.
-          pnpm install --prod --frozen-lockfile
-
           cd "${LIVE}"
           echo "Hard reset live tree to origin/main (no nuclear src wipe)..."
           git reset --hard origin/main