feat(ccam): add ccam as a standalone plugin entry

Sources from the Claude-Code-Monitor repo (ref: main) via a url plugin
source — the dashboard's hooks/server/CLI/MCP, installable independently
of sg-all/sg-dev/sg-common.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -24,6 +24,16 @@
       "source": "./plugins/common",
       "description": "All staff — sg-prompt-sharpening skill for disambiguating requests before acting.",
       "category": "productivity"
+    },
+    {
+      "name": "ccam",
+      "source": {
+        "source": "url",
+        "url": "https://git.smartgift.io.vn/Smartgift-AI/Claude-Code-Monitor.git",
+        "ref": "main"
+      },
+      "description": "Claude Code Agent Monitor — the local-first dashboard as a plugin. Installs the event hooks, boots the dashboard server, puts the ccam CLI on PATH, and connects the MCP tools. No checkout, no npm run setup.",
+      "category": "monitoring"
     }
   ]
 }