fix: load .env from CWD with upward fallback in non-interactive CLI mode

load_dotenv() without arguments relies on find_dotenv() to locate the .env
file. The find_dotenv() function decides the search starting point based on
the environment:

- Interactive (REPL, python -c): _is_interactive() returns True
  -> starts from os.getcwd() (user's working directory) -> works
- Non-interactive (installed CLI entry point via pip/uv): _is_interactive()
  returns False -> walks up the call stack from the caller's frame, which
  resolves to site-packages/litellm/ -> never finds the user's .env

Fix: pass find_dotenv(usecwd=True) to load_dotenv(), anchoring the search
to CWD while preserving python-dotenv's upward directory traversal for
users who keep .env in a parent directory.

litellm/__init__.py

@@ -17,7 +17,7 @@ import os
 import dotenv as _dotenv
 
 if os.getenv("LITELLM_MODE", "DEV") == "DEV":
-    _dotenv.load_dotenv()
+    _dotenv.load_dotenv(dotenv_path=_dotenv.find_dotenv(usecwd=True))
 
 from typing import (
     Callable,

litellm/proxy/proxy_cli.py

@@ -10,7 +10,7 @@ from typing import TYPE_CHECKING, Any, Optional, Union
 
 import click
 import httpx
-from dotenv import load_dotenv
+from dotenv import find_dotenv, load_dotenv
 
 import litellm
 from litellm.constants import DEFAULT_NUM_WORKERS_LITELLM_PROXY
@@ -27,7 +27,7 @@ config_filename = "litellm.secrets"
 
 litellm_mode = os.getenv("LITELLM_MODE", "DEV")  # "PRODUCTION", "DEV"
 if litellm_mode == "DEV":
-    load_dotenv()
+    load_dotenv(find_dotenv(usecwd=True))
 from enum import Enum
 
 telemetry = None