refactor(server): Remove deprecated stdio property from McpServerConfiguration

Author: codeboyzhou

src/main/java/com/github/codeboyzhou/mcp/declarative/configuration/McpServerConfiguration.java

@@ -6,7 +6,6 @@
 
 public record McpServerConfiguration(
     @JsonProperty("enabled") boolean enabled,
-    @Deprecated(since = "0.7.0", forRemoval = true) @JsonProperty("stdio") boolean stdio,
     @JsonProperty("mode") ServerMode mode,
     @JsonProperty("name") String name,
     @JsonProperty("version") String version,