fix(rag): use bge embeddings on GCP Ollama lane

apps/api/src/api/v1/rag.py

@@ -8,9 +8,10 @@ leWOOOgo 原則: Router 只做 HTTP 轉發，業務邏輯在 KnowledgeRAGService
 建立者: Claude Code (Phase 33 ADR-067)
 """
 
-from fastapi import APIRouter, BackgroundTasks, HTTPException
+from fastapi import APIRouter, BackgroundTasks
 from pydantic import BaseModel
 
+from src.core.config import get_settings
 from src.services.knowledge_rag_service import get_knowledge_rag_service
 
 router = APIRouter(prefix="/rag", tags=["RAG Knowledge Base"])
@@ -43,9 +44,10 @@ async def trigger_index(background_tasks: BackgroundTasks) -> RagIndexResponse:
     - .agents/skills/*.md
     """
     background_tasks.add_task(_run_index)
+    model = get_settings().OLLAMA_EMBEDDING_MODEL
     return RagIndexResponse(
         status="accepted",
-        message="索引已排程，背景執行中（nomic-embed-text @ Ollama 111）",
+        message=f"索引已排程，背景執行中（{model} @ Ollama GCP-A/GCP-B/111）",
     )
 
 
@@ -76,15 +78,16 @@ async def rag_debug() -> dict:
     try:
         async with httpx.AsyncClient(timeout=10.0) as c:
             from src.core.config import get_settings as _gs
+            settings = _gs()
             r = await c.post(
-                f"{_gs().OLLAMA_URL}/api/embeddings",
-                json={"model": "nomic-embed-text", "prompt": "test"},
+                f"{settings.OLLAMA_URL}/api/embeddings",
+                json={"model": settings.OLLAMA_EMBEDDING_MODEL, "prompt": "test"},
             )
             ollama_ok = r.status_code == 200 if r.status_code == 200 else f"http_{r.status_code}"
     except Exception as e:
         ollama_ok = f"error: {type(e).__name__}: {e}"
 
-    return {"cwd": os.getcwd(), "paths": paths_check, "ollama_111_embed": ollama_ok}
+    return {"cwd": os.getcwd(), "paths": paths_check, "ollama_embedding": ollama_ok}
 
 
 @router.get("/stats", summary="索引統計")