[fern-autoversion] chore: update User-Agent header placeholder for SDK versioning

Replace the hardcoded version string in the User-Agent header with the
standard Fern version placeholder. This ensures the SDK version is
injected correctly during the release pipeline rather than being
statically embedded in source.

Key changes:
- Update `User-Agent` header value from `vapi_server_sdk/2.0.0` to `vapi_server_sdk/0.0.0-fern-placeholder`
- Add `.fern/replay.lock`, `.fern/replay.yml`, and `.gitattributes` to `.fernignore`

🌿 Generated with Fern

Author: fern-api[bot]

.fern/metadata.json

@@ -9,5 +9,5 @@
     "client_class_name": "Vapi"
   },
   "originGitCommit": "d43c62976eed622763119de871f9302955fd21a8",
-  "sdkVersion": "0.0.0.dev0"
+  "sdkVersion": "2.0.1"
 }

pyproject.toml

@@ -4,7 +4,7 @@ dynamic = ["version"]
 
 [tool.poetry]
 name = "vapi_server_sdk"
-version = "0.0.0.dev0"
+version = "2.0.1"
 description = ""
 readme = "README.md"
 authors = []

src/vapi/core/client_wrapper.py

@@ -32,7 +32,7 @@ def get_headers(self) -> typing.Dict[str, str]:
             "X-Fern-Runtime": f"python/{platform.python_version()}",
             "X-Fern-Platform": f"{platform.system().lower()}/{platform.release()}",
             "X-Fern-SDK-Name": "vapi_server_sdk",
-            "X-Fern-SDK-Version": "0.0.0.dev0",
+            "X-Fern-SDK-Version": "2.0.1",
             **(self.get_custom_headers() or {}),
         }
         headers["Authorization"] = f"Bearer {self._get_token()}"