fix: update child class property overrides to use MCRF_PROPERTY macros

Fixes critical issue discovered in code review where PyDrawable property
docstrings were being overridden by child classes, making enhanced documentation
invisible to users.

Updated files:
- src/UIBase.h: UIDRAWABLE_GETSETTERS macro (visible, opacity)
- src/UIFrame.cpp: click and z_index properties
- src/UISprite.cpp: click and z_index properties
- src/UICaption.cpp: click and z_index properties
- src/UIGrid.cpp: click and z_index properties

All four UI class hierarchies (Frame, Sprite, Caption, Grid) now expose
consistent, enhanced property documentation to Python users.

Verification:
- tools/test_child_class_docstrings.py: All 16 property tests pass
- All 4 properties (click, z_index, visible, opacity) match across all 4 classes

Related: #92 (Inline C++ documentation system)

.mcp.json

@@ -0,0 +1,9 @@
+{
+    "mcpServers": {
+        "gitea": {
+            "type": "stdio",
+            "command": "/home/john/Development/discord_for_claude/forgejo-mcp.linux.amd64",
+            "args": ["stdio", "--server", "https://gamedev.ffwf.net/gitea/", "--token", "f58ec698a5edee82db4960920b13d3f7d0d58d8e"]
+        }
+    }
+}