fix(rag): embed 改用 settings.OLLAMA_URL — K3s NetworkPolicy 擋住直連 188:11434

nomic-embed-text 在 111 也有，改走 OLLAMA_URL (111) 避開 NetworkPolicy

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/api/src/services/knowledge_rag_service.py

@@ -29,11 +29,12 @@ from src.core.config import get_settings
 logger = structlog.get_logger(__name__)
 settings = get_settings()
 
-# nomic-embed-text 在 188 (記憶體充足)
-_EMBED_URL = "http://192.168.0.188:11434"
+# nomic-embed-text — 使用 settings.OLLAMA_URL (111, K3s NetworkPolicy 可達)
+# 188 雖然記憶體更多但 K3s NetworkPolicy 擋住 11434，改用 111
+# 2026-04-10 Claude Sonnet 4.6
 _EMBED_MODEL = "nomic-embed-text"
 
-# 生成回答用 111 (快)
+# 生成回答用同一個 OLLAMA_URL (111)
 _GEN_MODEL = "qwen2.5:7b-instruct"
 
 _TOP_K = 5            # 取最相似 5 筆
@@ -105,7 +106,7 @@ class KnowledgeRAGService:
         try:
             http = await self._get_http()
             resp = await http.post(
-                f"{_EMBED_URL}/api/embeddings",
+                f"{settings.OLLAMA_URL}/api/embeddings",
                 json={"model": _EMBED_MODEL, "prompt": text},
             )
             if resp.status_code == 200: