fix: flask_restx namespace path wrong (#24456)

api/controllers/files/__init__.py

     doc="/docs",  # Enable Swagger UI at /files/docs
 )
 
-files_ns = Namespace("files", description="File operations")
+files_ns = Namespace("files", description="File operations", path="/")
 
 from . import image_preview, tool_files, upload
 

api/controllers/mcp/__init__.py

     doc="/docs",  # Enable Swagger UI at /mcp/docs
 )
 
-mcp_ns = Namespace("mcp", description="MCP operations")
+mcp_ns = Namespace("mcp", description="MCP operations", path="/")
 
 from . import mcp
 

api/controllers/service_api/__init__.py

     doc="/docs",  # Enable Swagger UI at /v1/docs
 )
 
-service_api_ns = Namespace("service_api", description="Service operations")
+service_api_ns = Namespace("service_api", description="Service operations", path="/")
 
 from . import index
 from .app import annotation, app, audio, completion, conversation, file, file_preview, message, site, workflow