feat: enhance feed detail functionality with MCP interface improvements (#45)

* feat: add feed detail page functionality with gin and MCP interfaces

Add comprehensive Feed detail page support:
- Create new FeedDetailAction in xiaohongshu/feed_detail.go
- Add HTTP API endpoint POST /api/v1/feeds/detail
- Add MCP tool 'get_feed_detail' for MCP protocol support
- Support feed_id and xsec_token parameters (both required)
- Raw __INITIAL_STATE__ JSON data saved to feed_detail.json
- Return structured data for both HTTP and MCP interfaces

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

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

* feat: enhance feed detail functionality with MCP interface improvements

- Add comprehensive feed detail page support with proper data extraction
- Create dedicated feed_detail.go file for FeedDetailAction
- Optimize Go struct definitions based on actual JSON data analysis
- Remove unnecessary fields from FeedDetail, DetailImageInfo, CommentList, and Comment structs
- Update MCP interface description to reflect comment retrieval capability
- Support both HTTP REST API and MCP protocol interfaces
- Implement proper Vue 3 reactive data extraction from window.__INITIAL_STATE__
- Include feed content, user info, interaction data, and comment lists

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

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

* fix: restore JSON file writing for testing and improve code structure

- Restore feed_detail.json file writing for testing purposes
- Improve error handling by separating marshal and unmarshal steps
- Keep the original data extraction logic for complex Vue reactive data structure

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

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

* refactor: simplify JSON unmarshaling using struct instead of map[string]any

- Replace complex map[string]any extraction with direct struct unmarshaling
- Define inline struct matching the actual JSON response structure
- Remove unnecessary extractFeedDetailData and extractNestedValue methods
- Significantly reduce code complexity and improve readability

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

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

* docs: improve MCP interface descriptions for better usability

- Enhance get_feed_detail parameter descriptions with clear source information
- Clarify publish_content images parameter supports both local paths and URLs
- Improve search_feeds description to specify supported search types
- Keep descriptions concise and practical without over-complication

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

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

* fix: revert search_feeds keyword description to keep it simple

- Remove unnecessary details from keyword description
- Keep interface descriptions concise and clear

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

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

streamable_http.go

@@ -176,11 +176,11 @@ func (s *AppServer) processToolsList(request *JSONRPCRequest) *JSONRPCResponse {
 					},
 					"content": map[string]interface{}{
 						"type":        "string",
-						"description": "正文内容",
+						"description": "正文内容，支持话题标签",
 					},
 					"images": map[string]interface{}{
 						"type":        "array",
-						"description": "图片路径列表（发布图文时使用）",
+						"description": "图片路径列表，支持本地路径或URL",
 						"items": map[string]interface{}{
 							"type": "string",
 						},
@@ -203,7 +203,7 @@ func (s *AppServer) processToolsList(request *JSONRPCRequest) *JSONRPCResponse {
 		},
 		{
 			"name":        "search_feeds",
-			"description": "搜索小红书内容（前提：用户已登录）",
+			"description": "搜索小红书内容（需要已登录）",
 			"inputSchema": map[string]interface{}{
 				"type": "object",
 				"properties": map[string]interface{}{
@@ -215,6 +215,24 @@ func (s *AppServer) processToolsList(request *JSONRPCRequest) *JSONRPCResponse {
 				"required": []string{"keyword"},
 			},
 		},
+		{
+			"name":        "get_feed_detail",
+			"description": "获取小红书笔记详情，返回笔记内容、图片、作者信息、互动数据（点赞/收藏/分享数）及评论列表",
+			"inputSchema": map[string]interface{}{
+				"type": "object",
+				"properties": map[string]interface{}{
+					"feed_id": map[string]interface{}{
+						"type":        "string",
+						"description": "小红书笔记ID，从Feed列表获取",
+					},
+					"xsec_token": map[string]interface{}{
+						"type":        "string",
+						"description": "访问令牌，从Feed列表的xsecToken字段获取",
+					},
+				},
+				"required": []string{"feed_id", "xsec_token"},
+			},
+		},
 	}
 
 	return &JSONRPCResponse{
@@ -255,6 +273,8 @@ func (s *AppServer) processToolCall(ctx context.Context, request *JSONRPCRequest
 		result = s.handleListFeeds(ctx)
 	case "search_feeds":
 		result = s.handleSearchFeeds(ctx, toolArgs)
+	case "get_feed_detail":
+		result = s.handleGetFeedDetail(ctx, toolArgs)
 	default:
 		return &JSONRPCResponse{
 			JSONRPC: "2.0",