feat(F-055): completed feature

backlog/features.json

@@ -2919,6 +2919,44 @@
       },
       "acceptance": "1. Backend se mantiene estable bajo carga normal (no muere sin causa aparente). 2. Si el backend muere, monolith.sh lo reinicia automáticamente. 3. /api/auth/login en 3003 usa NEXT_PUBLIC_API_URL configurable. 4. /api/auth/login responde códigos del backend (no 500/502) cuando el backend está vivo.",
       "completed_at": "2026-08-19T11:15:30Z"
+    },
+    {
+      "id": "F-055",
+      "type": "feature",
+      "title": "Image thumbnails: backend resize cache + frontend max-size",
+      "problem": "Product images served at full resolution everywhere, causing slow loads on listings and layout overflow on detail pages.",
+      "goal": "Backend generates and caches 40px and 200px thumbnails; frontend applies CSS max-size to prevent overflow.",
+      "scope_in": [
+        "Image resize endpoint: GET /images/:id/thumb?w=40 and ?w=200",
+        "Disk cache for resized images under .thumbs/",
+        "CSS max-width/max-height on product detail page",
+        "Admin product edit preview uses 200px thumbnail"
+      ],
+      "scope_out": [
+        "No CDN integration",
+        "No WebP/AVIF conversion",
+        "No image upload pipeline changes"
+      ],
+      "priority": "high",
+      "risk": "low",
+      "depends_on": [],
+      "description": "Problem: product images served at full resolution everywhere. Goal: resize+cache 40px/200px thumbnails server-side + CSS overflow guard. Type: feature. Priority: high. Risk: low.",
+      "acceptance": [
+        "GET /images/:id/thumb?w=40 returns resized image with cache hit on second request",
+        "GET /images/:id/thumb?w=200 returns 200px resized image",
+        "Product detail page images respect max-width: 100% and max-height: 600px",
+        "No new raw full-size images served in product listings",
+        "verify.sh is green"
+      ],
+      "status": "done",
+      "created_at": "2026-08-19",
+      "gates": {
+        "reviewer": true,
+        "security": true,
+        "qa": true,
+        "close": true
+      },
+      "completed_at": "2026-08-19T11:48:32Z"
     }
   ]
 }