feat(ai): integrate local Ollama AI for in-context sentence translation and caching (Task 13)

app/config.py

@@ -40,3 +40,7 @@ MYMEMORY_EMAIL = os.getenv("MYMEMORY_EMAIL", "admin@qpid.pro")
 
 DB_PATH = Path(os.getenv("DB_PATH", str(BASE_DIR / "data" / "notes.db")))
 DB_PATH.parent.mkdir(parents=True, exist_ok=True)
+
+OLLAMA_BASE_URL = os.getenv("OLLAMA_BASE_URL", "http://127.0.0.1:11434").rstrip("/")
+OLLAMA_MODEL = os.getenv("OLLAMA_MODEL", "qwen2.5:1.5b")
+