lsp: Surface remote server info

[mohin-io]

Overview

• Extend the LSP metadata we propagate to guests (including WSL) so ServerInfo shows the server binary, configuration, and workspace folders instead of "Unknown".
• Added a LanguageServerBinary proto payload, expanded LanguageServer/ServerMetadataUpdated, and taught the LSP store to capture those fields for remote servers so the log viewer can display them.

Design Decisions

• Reused the existing metadata broadcasts (StartLanguageServer + ServerMetadataUpdated) so host and guests stay in sync without new RPCs.
• Store the remote metadata alongside existing LanguageServerStatus entries and surface it in the log view fallback when the server isn’t running locally.
• Left the database-backed collab metadata as optional defaults (None/empty) to avoid schema changes while still compiling with the new proto shape.

Testing

• Not run (Rust toolchain/cargo is unavailable in this environment).

Fixes #39582.

Release Notes:

• Show remote language server metadata (binary, configuration, workspace folders) in Server Info for guests.

[SomeoneToIgnore]

Not run (Rust toolchain/cargo is unavailable in this environment).

Sorry, this looks very odd (same as the errors in CI).
There's always a possibility to do cargo run ssh://127.0.0.1/~/work/ec4rs -- --foreground and test the things locally.

Please, add some screenshots how does this look like in such test.