feat: integrate govdoc module into leaudit platform

fastapi_modules/fastapi_leaudit/govdoc_engine/llm/client.py

@@ -11,7 +11,22 @@ import re
 import time
 from typing import Any
 
-from openai import AsyncOpenAI, OpenAI, APIError, APIConnectionError, RateLimitError
+try:
+    from openai import AsyncOpenAI, OpenAI, APIError, APIConnectionError, RateLimitError
+    _OPENAI_IMPORT_ERROR: Exception | None = None
+except ModuleNotFoundError as exc:  # pragma: no cover - optional dependency
+    AsyncOpenAI = None  # type: ignore[assignment]
+    OpenAI = None  # type: ignore[assignment]
+    _OPENAI_IMPORT_ERROR = exc
+
+    class APIError(Exception):
+        status_code: int | None = None
+
+    class APIConnectionError(Exception):
+        pass
+
+    class RateLimitError(Exception):
+        pass
 
 from fastapi_admin.config import (
     LLM_API_KEY,
@@ -125,7 +140,13 @@ class LlmClient:
     ):
         key = api_key or LLM_API_KEY
         self._misconfigured_error: LlmConfigError | None = None
-        if not key:
+        if OpenAI is None or AsyncOpenAI is None:
+            self._client = None
+            self._aclient = None
+            self._misconfigured_error = LlmConfigError(
+                "python package 'openai' is not installed; govdoc LLM features are unavailable."
+            )
+        elif not key:
             self._client = None
             self._aclient = None
             self._misconfigured_error = LlmConfigError(