D1 Part 3 leftovers: remove 8 residual emoji + Python emoji gate

- The D0 grep gate false-negatived multibyte emoji on Windows (its zero
  was wrong). scripts/emoji_gate.py scans by Unicode codepoint; it found
  8 survivors: backups.html (📁→file-text icon, 🔄 restore-info text),
  debug.html (🔄→'fut', 🔒→'titkosított'), deploy.html (📦→upload icon,
  ★ default-marker → '(alapértelmezett)'), storage.html (📦→upload icon,
  📦 in the migrate-target option → plain text). All → sprite icons or
  plain words.
- Gates: scripts/emoji_gate.py = 0; new Go TestNoEmojiInTemplates
  codepoint scan keeps it enforced (allowlist: ✓✗✔✘•●○■▶ monochrome
  text marks). go build/vet/test ./... green (18 pkgs).

controller/internal/web/templates/storage.html

@@ -102,7 +102,7 @@
                             <div class="storage-app-row">
                                 <a href="/apps/{{.Stack}}" class="storage-app-link">{{.Name}}</a>
                                 {{if .SizeHuman}}<span class="mono form-hint">{{.SizeHuman}}</span>{{end}}
-                                <span class="btn btn-xs btn-outline" style="opacity:.45;cursor:not-allowed" title="Hamarosan">📦 Mozgatás</span>
+                                <span class="btn btn-xs btn-outline" style="opacity:.45;cursor:not-allowed" title="Hamarosan"><svg class="ico ico-sm"><use href="#i-upload"/></svg> Mozgatás</span>
                             </div>
                             {{end}}
                         </div>
@@ -151,7 +151,7 @@
                 {{$src := .Path}}
                 <span class="migrate-inline" style="display:inline-flex;gap:.35rem;align-items:center">
                     <select id="migrate-target-{{.Path}}" class="btn btn-xs btn-outline">
-                        <option value="">📦 Áthelyezés ide…</option>
+                        <option value="">Áthelyezés ide…</option>
                         {{range $.StoragePaths}}{{if and (ne .Path $src) .Schedulable (not .Disconnected) (not .Decommissioned)}}<option value="{{.Path}}">{{.Label}} ({{.Path}})</option>{{end}}{{end}}
                     </select>
                     <button class="btn btn-xs btn-outline" onclick="storageMigrateAll('{{.Path}}','{{.Label}}')">Összes adat áthelyezése</button>