Fix P1 Rust: use dd0c_route:: instead of crate:: in binary imports, add hex crate

Binary targets (api, proxy, worker) can't use crate:: to access lib modules.
Must reference the library crate name dd0c_route:: instead.

products/01-llm-cost-router/Cargo.toml

@@ -18,6 +18,7 @@ name = "dd0c-worker"
 path = "src/worker/main.rs"
 
 [dependencies]
+hex = "0.4.3"
 # Web framework
 axum = { version = "0.7", features = ["ws", "macros"] }
 tokio = { version = "1", features = ["full"] }

products/01-llm-cost-router/src/api/handler.rs

@@ -9,8 +9,8 @@ use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 use uuid::Uuid;
 
-use crate::auth::{AuthContext, AuthError, AuthProvider, Role};
-use crate::config::AppConfig;
+use dd0c_route::auth::{AuthContext, AuthError, AuthProvider, Role};
+use dd0c_route::config::AppConfig;
 
 pub struct ApiState {
     pub auth: Arc<dyn AuthProvider>,

products/01-llm-cost-router/src/proxy/handler.rs

@@ -13,10 +13,10 @@ use tracing::{info, warn};
 
 use super::middleware;
 
-use crate::auth::AuthProvider;
-use crate::config::AppConfig;
-use crate::data::{EventQueue, TelemetryEvent};
-use crate::router::RouterBrain;
+use dd0c_route::auth::AuthProvider;
+use dd0c_route::config::AppConfig;
+use dd0c_route::data::{EventQueue, TelemetryEvent};
+use dd0c_route::router::RouterBrain;
 
 pub struct ProxyState {
     pub auth: Arc<dyn AuthProvider>,
@@ -181,8 +181,8 @@ pub enum ProxyError {
     UpstreamError(String),
 }
 
-impl From<crate::auth::AuthError> for ProxyError {
-    fn from(e: crate::auth::AuthError) -> Self {
+impl From<dd0c_route::auth::AuthError> for ProxyError {
+    fn from(e: dd0c_route::auth::AuthError) -> Self {
         ProxyError::AuthError(e.to_string())
     }
 }