(WIP) Base for Java docs (#125)

* Base for Java docs

* docs(java): Migrate Java-SDK/docs

Add visual documentation for Java SDK architecture:

- PlantUML class diagrams showing core components and relationships
- Client and server architecture diagrams
- Stack architecture overview
- Generated UML class diagram with detailed implementation structure

* Add Java Client and Server quickstarts

* reorder, redact, correct java-sdk docs

Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>

* updated updates.mdx

* fix docs.json

---------

Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>
Co-authored-by: Christian Tzolov <christian.tzolov@broadcom.com>
Co-authored-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>
Co-authored-by: David Soria Parra <davidsp@anthropic.com>

docs.json

@@ -9,10 +9,9 @@
   },
   "favicon": "/favicon.svg",
   "navigation": {
-    "anchors": [
+    "tabs": [
       {
-        "anchor": "Documentation",
-        "icon": "book-open",
+        "tab": "Documentation",
         "groups": [
           {
             "group": "Get Started",
@@ -59,6 +58,20 @@
             ]
           }
         ]
+      },
+      {
+        "tab": "SDKs",
+        "icon": "book-open",
+        "groups": [
+          {
+            "group": "Java",
+            "pages": [
+              "sdk/java/mcp-overview",
+              "sdk/java/mcp-client",
+              "sdk/java/mcp-server"
+            ]
+          }
+        ]
       }
     ],
     "global": {