feat(gemini): normalize base URL to strip API version suffixes

Automatically remove trailing slashes and version paths (e.g., /v1beta) from GEMINI_BASE_URL
Update GeminiAnalyzer to use the normalized URL and add type hints
Add test coverage for Gemini client configuration

src/uipath_explainator/config.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 from pathlib import Path
+import re
 from typing import Self
 
 from dotenv import load_dotenv
@@ -30,3 +31,10 @@ class Settings:
     def require_api_key(self) -> None:
         if not self.api_key:
             raise ValueError("Missing GEMINI_API_KEY (or GOOGLE_API_KEY) in the environment.")
+
+    def normalized_base_url(self) -> str | None:
+        if not self.base_url:
+            return None
+
+        base_url = self.base_url.strip().rstrip("/")
+        return re.sub(r"/v\d+(?:alpha|beta)?$", "", base_url, flags=re.IGNORECASE)

src/uipath_explainator/gemini.py

@@ -1,7 +1,8 @@
 from __future__ import annotations
 
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from pathlib import Path
+from typing import Any
 import json
 
 from .config import Settings
@@ -10,6 +11,8 @@ from .config import Settings
 @dataclass(slots=True)
 class GeminiAnalyzer:
     settings: Settings
+    _types: Any = field(init=False, repr=False)
+    _client: Any = field(init=False, repr=False)
 
     def __post_init__(self) -> None:
         self.settings.require_api_key()
@@ -18,8 +21,9 @@ class GeminiAnalyzer:
         from google.genai import types
 
         http_options = types.HttpOptions(timeout=120_000)
-        if self.settings.base_url:
-            http_options = types.HttpOptions(base_url=self.settings.base_url, timeout=120_000)
+        base_url = self.settings.normalized_base_url()
+        if base_url:
+            http_options = types.HttpOptions(base_url=base_url, timeout=120_000)
 
         self._types = types
         self._client = genai.Client(api_key=self.settings.api_key, http_options=http_options)