refactor(app): ingest API 6변종 → 2 (ingest + ingest_with_config{IngestOpts})

summary_only를 IngestOpts에 흡수, progress/cancellable/opts 변종 제거.
재인덱싱 게이트 CHUNKS/SEARCH/ASK byte-IDENTICAL, clippy --all-targets 0.

crates/kebab-app/tests/ask_smoke.rs

@@ -21,7 +21,7 @@ use common::TestEnv;
 #[ignore = "requires real Ollama on 127.0.0.1:11434"]
 fn ask_lexical_smoke() {
     let env = TestEnv::lexical_only();
-    kebab_app::ingest_with_config(env.config.clone(), env.scope(), true).unwrap();
+    kebab_app::ingest_with_config(env.config.clone(), env.scope(), kebab_app::IngestOpts { summary_only: true, ..Default::default() }).unwrap();
 
     let opts = kebab_app::AskOpts {
         k: 5,