feat(frontend): add Test Suite management and Next Reply case editor

Replace the test-cases placeholder with suite list/detail flows, multi-select and drag reorder, and an edit-only single-step reply editor with keyword/LLM assertions.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/assistant-editor/debug-auto-test.tsx

@@ -35,7 +35,8 @@ export type TestCaseKind =
   | "user_simulation"
   | "tool_call"
   | "fixed_dialogue"
-  | "single_turn";
+  | "single_turn"
+  | "voice_run";
 
 export type ChatScriptTurn = {
   role: "user" | "assistant";
@@ -103,6 +104,7 @@ const KIND_LABEL: Record<TestCaseKind, string> = {
   tool_call: "工具调用",
   fixed_dialogue: "固定对话",
   single_turn: "单轮响应",
+  voice_run: "语音运行",
 };
 
 const RECENT_IDS = ["tc-dual-car", "tc-hello"];