[kimi] Add /api/matrix/config endpoint for world configuration (#674) (#736)

config/matrix.yaml

@@ -0,0 +1,28 @@
+# Matrix World Configuration
+# Serves lighting, environment, and feature settings to the Matrix frontend.
+
+lighting:
+  ambient_color: "#1a1a2e"
+  ambient_intensity: 0.4
+  point_lights:
+    - color: "#FFD700"
+      intensity: 1.2
+      position: { x: 0, y: 5, z: 0 }
+    - color: "#3B82F6"
+      intensity: 0.8
+      position: { x: -5, y: 3, z: -5 }
+    - color: "#A855F7"
+      intensity: 0.6
+      position: { x: 5, y: 3, z: 5 }
+
+environment:
+  rain_enabled: false
+  starfield_enabled: true
+  fog_color: "#0f0f23"
+  fog_density: 0.02
+
+features:
+  chat_enabled: true
+  visitor_avatars: true
+  pip_familiar: true
+  workshop_portal: true