feat: Enhance plugin runtime configuration and hook management

- Added `inactive_plugins` field to `RunnerReadyPayload` and `ReloadPluginResultPayload` to track plugins that are not activated due to being disabled or unmet dependencies.
- Introduced `InspectPluginConfigPayload` and `InspectPluginConfigResultPayload` for inspecting plugin configuration metadata.
- Implemented `PluginActivationStatus` enum to better represent plugin activation states.
- Updated `_activate_plugin` method to return activation status and handle inactive plugins accordingly.
- Added hooks for send service to allow modification of messages before and after sending.
- Created new runtime routes for listing hook specifications in the WebUI.
- Refactored plugin configuration handling to utilize runtime inspection for better accuracy and flexibility.
- Enhanced error handling and logging for plugin configuration operations.

src/plugin_runtime/hook_schema_utils.py

@@ -0,0 +1,31 @@
+"""Hook 参数模型构造辅助。"""
+
+from __future__ import annotations
+
+from copy import deepcopy
+from typing import Any, Dict, Sequence
+
+
+def build_object_schema(
+    properties: Dict[str, Dict[str, Any]],
+    *,
+    required: Sequence[str] | None = None,
+) -> Dict[str, Any]:
+    """构造对象级 JSON Schema。
+
+    Args:
+        properties: 字段定义映射。
+        required: 必填字段名列表。
+
+    Returns:
+        Dict[str, Any]: 标准化后的对象级 Schema。
+    """
+
+    schema: Dict[str, Any] = {
+        "type": "object",
+        "properties": deepcopy(properties),
+    }
+    normalized_required = [str(item).strip() for item in (required or []) if str(item).strip()]
+    if normalized_required:
+        schema["required"] = normalized_required
+    return schema