feat: show local Docker images on project detail page

- Add GET /api/projects/{id}/images endpoint returning local images matching the project
- Add ListImagesByRef with tag, size, and created timestamp to Docker client
- Display images table on project page with tag, ID (truncated), size (MB), and created date
- Only shown when Docker is available and images exist locally

web/src/lib/i18n/en.json

@@ -105,6 +105,11 @@
     "enableProxy": "Enable Proxy",
     "accessListId": "NPM Access List ID",
     "accessListIdHelp": "Per-project override. 0 = use global default from NPM settings.",
+    "localImages": "Local Docker Images",
+    "imageTag": "Tag",
+    "imageId": "Image ID",
+    "imageSize": "Size",
+    "imageCreated": "Created",
     "cpuLimit": "CPU Limit (cores)",
     "cpuLimitHelp": "e.g., 0.5, 1, 2. Leave 0 for unlimited",
     "memoryLimit": "Memory Limit (MB)",