[I] Remove LangChain4jMcpServerDefinition substitution when Camel drops HttpMcpTransport usage [camel-quarkus]

["jamesnetherton (via GitHub)" <gi...@apache.org>]

jamesnetherton opened a new issue, #9025:
URL: https://github.com/apache/camel-quarkus/issues/9025

   `camel-langchain4j-agent` still references `dev.langchain4j.mcp.client.transport.http.HttpMcpTransport` for the deprecated `sse` MCP transport type. That class was removed in LangChain4j `1.19.0`, which Camel Quarkus picked up when aligning with Quarkus LangChain4j `1.13.0`.
   
   Because Quarkus passes a bare `--link-at-build-time`, the unresolvable type fails native image analysis of `LangChain4jMcpServerDefinition.buildTransport`:
   
   ```
   Error: Discovered unresolved type during parsing: dev.langchain4j.mcp.client.transport.http.HttpMcpTransport$Builder.
   This error is reported at image build time because class
   org.apache.camel.component.langchain4j.agent.LangChain4jMcpServerDefinition is registered for linking at image build time
   by command line and command line.
   Error encountered while parsing org.apache.camel.component.langchain4j.agent.LangChain4jMcpServerDefinition.buildClient(LangChain4jMcpServerDefinition.java:208)
   ```
   
   As a workaround, `LangChain4jMcpServerDefinitionSubstitutions` in `camel-quarkus-support-langchain4j` substitutes `buildTransport` to drop the `sse` branch. The substitution duplicates the upstream method body for the remaining transports, so it will drift if Camel changes that code.
   
   Note that in JVM mode the `sse` transport type fails with `NoClassDefFoundError`, since the substitution applies to native mode only.
   
   Once Camel drops its usage of `HttpMcpTransport`, the following can be removed:
   
   * `extensions-support/langchain4j/runtime/src/main/java/org/apache/camel/quarkus/component/support/langchain4j/graal/LangChain4jMcpServerDefinitionSubstitutions.java`
   * The `org.graalvm.sdk:nativeimage` dependency in `extensions-support/langchain4j/runtime/pom.xml`, if nothing else needs it
   * `extensions/langchain4j-agent/runtime/src/main/doc/limitations.adoc`
   


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