Migrate to Jakarta EE Servlet 6.0

- Update build.gradle: jakarta.servlet-api:6.1.0
- Update EnhancedMcpServlet.groovy: Jakarta imports and servlet attributes
- Update WebFacadeStub.groovy: Complete Jakarta migration
  - New Servlet 6.0 methods (getRequestId, getProtocolRequestId, getServletConnection)
  - Removed deprecated methods (getSessionContext, getRealPath, etc.)
  - New sendRedirect(String, int, boolean) overload
- Update TestHealthServlet.java: Jakarta servlet imports

Aligns with upstream framework migration to Jakarta EE.

@@ -34,7 +34,7 @@ dependencies {
     compileOnly project(':framework')
 
     // Servlet API (provided by framework, but needed for compilation)
-    compileOnly 'javax.servlet:javax.servlet-api:4.0.1'
+    compileOnly 'jakarta.servlet:jakarta.servlet-api:6.1.0'
     
     // Test dependencies
     testImplementation project(':framework')

@@ -25,11 +25,11 @@ import org.moqui.context.ExecutionContext
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 
-import javax.servlet.ServletConfig
-import javax.servlet.ServletException
-import javax.servlet.http.HttpServlet
-import javax.servlet.http.HttpServletRequest
-import javax.servlet.http.HttpServletResponse
+import jakarta.servlet.ServletConfig
+import jakarta.servlet.ServletException
+import jakarta.servlet.http.HttpServlet
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
 import java.sql.Timestamp
 import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicBoolean
@@ -281,8 +281,8 @@ class EnhancedMcpServlet extends HttpServlet {
             // Modify request path to avoid ScreenResourceNotFoundException
             String originalRequestURI = request.getRequestURI()
             String originalPathInfo = request.getPathInfo()
-            request.setAttribute("javax.servlet.include.request_uri", "/mcp")
-            request.setAttribute("javax.servlet.include.path_info", "")
+            request.setAttribute("jakarta.servlet.include.request_uri", "/mcp")
+            request.setAttribute("jakarta.servlet.include.path_info", "")
             
         try {
             ec.initWebFacade(webappName, request, response)

@@ -13,10 +13,10 @@
  */
 package org.moqui.mcp.test;
 
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.io.PrintWriter;