feat(plugin): implement INVOKE_RERANK handler with run-scoped authorization

- Add invoke_rerank action handler in plugin handler
- Validate rerank model access via run session
- Cap documents at 64 for API limit
- Return sorted results by relevance score

src/langbot/templates/default-pipeline-config.json

@@ -38,57 +38,11 @@
     },
     "ai": {
         "runner": {
-            "runner": "local-agent",
+            "id": "plugin:langbot/local-agent/default",
             "expire-time": 0
         },
-        "local-agent": {
-            "model": {
-                "primary": "",
-                "fallbacks": []
-            },
-            "max-round": 10,
-            "prompt": [
-                {
-                    "role": "system",
-                    "content": "You are a helpful assistant. When tools are available, use them for exact calculations, data processing, and code execution instead of guessing. Unless the user explicitly asks for code or a script, return the result directly instead of printing the generated code."
-                }
-            ],
-            "knowledge-bases": [],
-            "box-session-id-template": "{launcher_type}_{launcher_id}",
-            "rerank-model": "",
-            "rerank-top-k": 5
-        },
-        "dify-service-api": {
-            "base-url": "https://api.dify.ai/v1",
-            "app-type": "chat",
-            "api-key": "your-api-key",
-            "timeout": 30
-        },
-        "dashscope-app-api": {
-            "app-type": "agent",
-            "api-key": "your-api-key",
-            "app-id": "your-app-id",
-            "references-quote": "参考资料来自:"
-        },
-        "n8n-service-api": {
-            "webhook-url": "http://your-n8n-webhook-url",
-            "auth-type": "none",
-            "basic-username": "",
-            "basic-password": "",
-            "jwt-secret": "",
-            "jwt-algorithm": "HS256",
-            "header-name": "",
-            "header-value": "",
-            "timeout": 120,
-            "output-key": "response"
-        },
-        "langflow-api": {
-            "base-url": "http://localhost:7860",
-            "api-key": "your-api-key",
-            "flow-id": "your-flow-id",
-            "input-type": "chat",
-            "output-type": "chat",
-            "tweaks": "{}"
+        "runner_config": {
+            "plugin:langbot/local-agent/default": {}
         }
     },
     "output": {
@@ -110,4 +64,4 @@
             "remove-think": false
         }
     }
-}
+}