[router] Configure experimental sgl-router via CLI flags instead of a config file (#27073)

Signed-off-by: Kangyan Zhou <zky314343421@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

experimental/sgl-router/tests/component/discovery/static_urls.rs

@@ -90,8 +90,7 @@ async fn static_urls_pd_role_resolved_end_to_end() {
     use axum::{routing::get, Json, Router};
     use serde_json::json;
     use sgl_router::config::{
-        ActiveLoadConfig, Config, DiscoveryBackend, DiscoveryConfig, ObservabilityConfig,
-        ProxyConfig, ServerConfig,
+        ActiveLoadConfig, Config, DiscoveryBackend, ObservabilityConfig, ProxyConfig, ServerConfig,
     };
     use sgl_router::discovery::{spawn_discovery, WorkerId};
     use sgl_router::workers::{manager, WorkerRegistry};
@@ -127,12 +126,16 @@ async fn static_urls_pd_role_resolved_end_to_end() {
             port: 0,
         },
         observability: ObservabilityConfig::default(),
-        models: vec![],
-        discovery: DiscoveryConfig {
-            backend: DiscoveryBackend::StaticUrls(StaticUrlsDiscoveryConfig {
-                urls: vec![url.clone()],
-            }),
+        model: sgl_router::config::ModelConfig {
+            id: "tiny".into(),
+            tokenizer_path: "tests/fixtures/tiny_tokenizer.json".into(),
+            policy: sgl_router::config::PolicyKind::RoundRobin,
+            circuit_breaker: None,
+            cache_aware: None,
         },
+        discovery: DiscoveryBackend::StaticUrls(StaticUrlsDiscoveryConfig {
+            urls: vec![url.clone()],
+        }),
         proxy: ProxyConfig::default(),
         active_load: ActiveLoadConfig::default(),
     };

experimental/sgl-router/tests/component/policies/cache_aware_zmq.rs

@@ -65,20 +65,18 @@ async fn zmq_indexer_routes_to_publishing_worker_e2e() {
             port: 0,
         },
         observability: Default::default(),
-        models: vec![sgl_router::config::ModelConfig {
+        model: sgl_router::config::ModelConfig {
             id: "tiny".into(),
             tokenizer_path: "tests/fixtures/tiny_tokenizer.json".into(),
             policy: sgl_router::config::PolicyKind::CacheAwareZmq,
             circuit_breaker: None,
             cache_aware: None,
-        }],
-        discovery: sgl_router::config::DiscoveryConfig {
-            backend: sgl_router::config::DiscoveryBackend::StaticUrls(
-                sgl_router::config::StaticUrlsDiscoveryConfig {
-                    urls: vec!["http://placeholder:0".into()],
-                },
-            ),
         },
+        discovery: sgl_router::config::DiscoveryBackend::StaticUrls(
+            sgl_router::config::StaticUrlsDiscoveryConfig {
+                urls: vec!["http://placeholder:0".into()],
+            },
+        ),
         proxy: ProxyConfig::default(),
         active_load: ActiveLoadConfig::default(),
     };
@@ -127,6 +125,7 @@ async fn zmq_indexer_routes_to_publishing_worker_e2e() {
         topic: String::new(),
         block_size,
         dp_size: 1,
+        is_bigram: false,
     };
     kv_index.add_worker(url_a, Some(preresolved.clone())).await;
     kv_index.add_worker(url_b, Some(preresolved)).await;

experimental/sgl-router/tests/component/policies/kv_events_two_subscribers.rs

@@ -41,6 +41,7 @@ async fn two_independent_subscribers_converge_to_same_tree_state() {
         topic: String::new(),
         block_size,
         dp_size: 1,
+        is_bigram: false,
     };
 
     // 2. Two independent router-process surrogates, each with its own
@@ -173,6 +174,7 @@ async fn two_subscribers_merge_events_from_two_publishers() {
         topic: String::new(),
         block_size,
         dp_size: 1,
+        is_bigram: false,
     };
     let cfg_y = EventConfig {
         host: "127.0.0.1".into(),
@@ -180,6 +182,7 @@ async fn two_subscribers_merge_events_from_two_publishers() {
         topic: String::new(),
         block_size,
         dp_size: 1,
+        is_bigram: false,
     };
 
     // Both routers subscribe to BOTH workers — the production fan-out.