Add Windows support (socket types, OpenSSL linking, IPv6 fallback)

[AliRezaBeigy]

Adds Windows support with socket type compatibility, OpenSSL linking fixes, and IPv6 fallback for UDP socket binding.

Changes:

• Add winapi dependency for Windows socket types
• Fix OpenSSL library linking on Windows (libssl/libcrypto instead of ssl/crypto)
• Replace pthread with ws2_32 on Windows
• Implement Windows-compatible sockaddr_storage using winapi
• Add Windows versions of socket_addr_to_storage and sockaddr_storage_to_socket_addr
• Update all server/client code to use platform-agnostic SockaddrStorage type
• Add IPv6→IPv4 fallback for UDP socket binding (common on Windows)

I test and build the changes in https://github.com/AliRezaBeigy/slipstream-rust-deploy

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This pull request adds comprehensive Windows support to the Slipstream QUIC proxy by implementing platform-specific socket type handling, fixing OpenSSL linking, and adding IPv6 to IPv4 fallback for UDP socket binding.

Changes:

• Added Windows-compatible socket type abstractions using winapi crate with conditional compilation
• Updated OpenSSL and pthread library linking to use Windows-appropriate libraries (libssl/libcrypto and ws2_32)
• Implemented IPv6→IPv4 fallback for UDP socket binding to handle Windows systems without IPv6 support

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
crates/slipstream-ffi/Cargo.toml	Adds winapi dependency for Windows socket types
crates/slipstream-ffi/build.rs	Conditionally links OpenSSL libraries (libssl/libcrypto on Windows) and replaces pthread with ws2_32 on Windows
crates/slipstream-ffi/src/runtime.rs	Implements Windows-compatible SockaddrStorage type alias and socket conversion functions using winapi structures
crates/slipstream-ffi/src/picoquic.rs	Updates imports to use Windows socket types conditionally
crates/slipstream-ffi/src/lib.rs	Exports SockaddrStorage type for use by other crates
crates/slipstream-server/src/udp_fallback.rs	Updates type signatures and test helper to use platform-agnostic SockaddrStorage
crates/slipstream-server/src/server.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/runtime/setup.rs	Adds IPv6 to IPv4 fallback for UDP socket binding
crates/slipstream-client/src/runtime/path.rs	Updates socket address storage to use SockaddrStorage type
crates/slipstream-client/src/runtime.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/dns/response.rs	Updates type signature to use SockaddrStorage
crates/slipstream-client/src/dns/resolver.rs	Updates struct fields and function signatures to use SockaddrStorage
crates/slipstream-client/src/dns/poll.rs	Updates socket address storage variables to use SockaddrStorage type
crates/slipstream-client/src/dns/path.rs	Updates socket address storage variable to use SockaddrStorage type

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[AliRezaBeigy]

Sorry for the late reply, I need more time to manage the test and copilot. Before that I have to manage picoquic. I will create a pr for that too.

[AliRezaBeigy]

picoquic compatibility change pull request created PR, I suggest merging that before this.
@Mygod could you please approve the workflow

[Mygod]

Hi I have limited bandwidth so it will be a while until I get to this. Thanks for the patience. :)

[AliRezaBeigy]

Branch has been rebased and all tests have passed successfully. However, this branch requires Mygod/slipstream-picoquic#1 to achieve full Windows compatibility. Please take a look that PR first if you find time.