feat: complete Rust backend UI compatibility

src/shared/headers.rs

@@ -0,0 +1,9 @@
+// BoosAPI custom headers. Do not introduce x-metapi-* headers.
+
+pub const HEADER_SITE_ID: &str = "x-boosapi-site-id";
+pub const HEADER_TOKEN_ID: &str = "x-boosapi-token-id";
+pub const HEADER_CHANNEL_ID: &str = "x-boosapi-channel-id";
+pub const HEADER_REQUEST_ID: &str = "x-boosapi-request-id";
+pub const HEADER_UPSTREAM_MODEL: &str = "x-boosapi-upstream-model";
+pub const HEADER_TRUNCATED: &str = "x-boosapi-truncated";
+pub const HEADER_PROXIED: &str = "x-boosapi-proxied";

src/shared/mod.rs

@@ -1,10 +1,12 @@
 // Shared utilities
 
+pub mod headers;
 pub mod json;
 pub mod pagination;
 pub mod sse;
 pub mod time;
 
+pub use headers::*;
 pub use json::*;
 pub use pagination::*;
 pub use sse::*;