* refactor: replace axios and node fetch with electron's net module for network requests in preprocess providers
- Updated Doc2xPreprocessProvider and MineruPreprocessProvider to use net.fetch instead of axios for making HTTP requests.
- Improved error handling for network responses across various methods.
- Removed unnecessary AxiosRequestConfig and related code to streamline the implementation.
* lint
* refactor(Doc2xPreprocessProvider): enhance file validation and upload process
- Added file size validation to prevent loading files larger than 300MB into memory.
- Implemented file size check before reading the PDF to ensure efficient memory usage.
- Updated the file upload method to use a stream, setting the 'Content-Length' header for better handling of large files.
* refactor(brave-search): update net.fetch calls to use url.toString()
- Modified all instances of net.fetch to use url.toString() for better URL handling.
- Ensured consistency in how URLs are passed to the fetch method across various functions.
* refactor(MCPService): improve URL handling in net.fetch calls
- Updated net.fetch to use url.toString() for better type handling of URLs.
- Ensured consistent URL processing across the MCPService class.
* feat(ProxyManager): integrate axios with fetch proxy support
- Added axios as a dependency to enable fetch proxy usage.
- Implemented logic to set axios's adapter to 'fetch' for proxy handling.
- Preserved original axios adapter for restoration when disabling the proxy.
