feat(cosmetics): оформление профиля — галерея, роли и личные стили

- миграция 00013: guild_cosmetics (рамки и иконки) и user_styles («для друзей»
  и пер-серверные стили) (AGENT.md 7.2, 7.4)
- store: CRUD галереи, личные стили и вычисление оформления поэлементно
  (роль → пер-серверный стиль → «для друзей» → дефолт) с откатом, когда роль
  больше не выдаёт элемент
- API: галерея сервера под MANAGE_ROLES, оформление роли в create/update,
  GET/PUT/DELETE /users/@me/styles с доступными элементами по областям
- клиент: редактор личного стиля с предпросмотром, галерея оформления в
  настройках сервера, оформление роли в разделе «Роли»
- рендер: рамка под аватаром, иконка рядом с ником, цвет и встроенные эффекты
  ника (CSS, при reduced-motion статично) в ленте и списке участников

web/src/i18n/locales/en.json

@@ -676,6 +676,31 @@
         "hint": "Profile badges and frames.",
         "empty": "No decorations yet.",
         "stub": "Badges, frames and profile effects are coming later."
+      },
+      "style": {
+        "title": "Profile decoration",
+        "description": "Frame, icon, nick colour and effect. You can only pick what your roles grant: on a server the role wins, then the per-server style, then the friends style.",
+        "scope": "Where to apply",
+        "scopeGlobal": "For friends (DMs and global places)",
+        "preview": "preview",
+        "frame": "Avatar frame",
+        "badge": "Icon next to the nick",
+        "color": "Nick colour",
+        "colorDefault": "Same as role",
+        "effect": "Nick effect",
+        "none": "No element",
+        "noFrames": "No frames granted by roles yet — a server admin grants them.",
+        "noBadges": "No icons granted by roles yet.",
+        "reset": "Reset style",
+        "priorityHint": "Changes apply immediately.",
+        "effects": {
+          "none": "No effect",
+          "gradient": "Gradient",
+          "glow": "Glow",
+          "fire": "Fire",
+          "shimmer": "Shimmer",
+          "glitch": "Glitch"
+        }
       }
     },
     "security": {
@@ -842,7 +867,12 @@
         "description": "Role colour and position. Role management arrives in the next phases.",
         "empty": "This server has no roles yet.",
         "position": "Position {{position}}",
-        "default": "default"
+        "default": "default",
+        "frame": "Frame",
+        "badge": "Icon",
+        "nickColor": "Nick colour",
+        "nickEffect": "Nick effect",
+        "decorationSaved": "Role decoration saved."
       },
       "danger": {
         "title": "Danger zone",
@@ -986,6 +1016,21 @@
         "empty": "none",
         "notImage": "An image file is required (PNG, JPEG, GIF, WebP).",
         "tooLarge": "The file is larger than 8 MB."
+      },
+      "cosmetics": {
+        "title": "Decoration gallery",
+        "description": "Avatar frames and icons next to the nick. Uploaded items are granted to roles in the Roles section; animated GIF and WebP keep their animation.",
+        "upload": "Upload",
+        "empty": "Nothing uploaded yet.",
+        "limit": "{{used}} of {{total}} used",
+        "name": "Item name",
+        "notImage": "An image file is required",
+        "tooLarge": "File is larger than 5 MB",
+        "deleteConfirm": "Delete the item? It disappears from all roles and personal styles.",
+        "kind": {
+          "frame": "Frames",
+          "badge": "Icons"
+        }
       }
     },
     "navLabel": "Settings sections",