test(auth): add _build_google_auth() unit tests and bump to v1.1.1

- 4 tests covering unconfigured/configured/no-jwt-key/stdio-warning paths
- Validates GoogleProvider is called with correct kwargs
- Verifies jwt_signing_key is omitted (not passed empty) when unset

Co-authored-by: Claude <noreply@anthropic.com>

pyproject.toml

@@ -10,7 +10,7 @@ build-backend = "hatchling.build"
 # ============================================================================
 [project]
 name = "unraid-mcp"
-version = "1.1.0"
+version = "1.1.1"
 description = "MCP Server for Unraid API - provides tools to interact with an Unraid server's GraphQL API"
 readme = "README.md"
 license = {file = "LICENSE"}