feat: Node file streaming, recursive listing, file type detection, and file delete

- Stream file GET/POST through controller without buffering in memory
- Add recursive and subdirectory filtering to node file listing
- Replace file extension with magic-based file type detection
- Add DELETE endpoint for node and project files
- Include directories in listing response
- Add params and stream support to http_query
- Fix lambda closures, streamer exception scope, and delete error codes

gns3server/schemas/controller/projects.py

@@ -114,7 +114,7 @@ class NodeFile(BaseModel):
     size: int = Field(..., description="File size in bytes")
     created_at: str = Field(..., description="File creation time (ISO 8601)")
     modified_at: str = Field(..., description="File modification time (ISO 8601)")
-    extension: str = Field(..., description="File extension")
+    file_type: str = Field(..., description="File type determined by the file command")
 
 
 class ProjectCompression(str, Enum):