port: complete python ledger mapping, audio commands bridge and platform stubs

- Added Client/root (74 modules, 3350 funcs) mapped to RUN_AS_IS
- Added UserInterface/PythonNetworkStreamModule.cpp.json mapped to PORTED
- Implemented AudioCommands queue bridging MilesLib SoundManager to Godot AudioDriver
- Implemented AudioDriver node for BGM crossfading, 2D UI SFX and 3D spatial sounds
- Implemented core platform stubs in PythonApplication, GrpScreen, and PythonGraphic
- Passed all 12 port tests (port_gate macos) and python_game_render_test

audit/port-map/Client/root/utils.py.json

@@ -0,0 +1,36 @@
+{
+  "reference": "../../Client/Eternexus/root/utils.py",
+  "reference_sha256": "228bd8169f3d0e1775788d23bde4a3bba18f88f9994daa0d27d95af291e61bb9",
+  "priority": "P3",
+  "contracts": [],
+  "functions": {
+    "Sandbox.__init__": {
+      "status": "RUN_AS_IS",
+      "impl": [
+        "assets/root/utils.py:Sandbox.__init__"
+      ],
+      "evidence": "executed directly by embedded CPython 2.7 runtime from 40250 pack/assets"
+    },
+    "Sandbox.add_allowed_modules": {
+      "status": "RUN_AS_IS",
+      "impl": [
+        "assets/root/utils.py:Sandbox.add_allowed_modules"
+      ],
+      "evidence": "executed directly by embedded CPython 2.7 runtime from 40250 pack/assets"
+    },
+    "Sandbox.add_prevented_modules": {
+      "status": "RUN_AS_IS",
+      "impl": [
+        "assets/root/utils.py:Sandbox.add_prevented_modules"
+      ],
+      "evidence": "executed directly by embedded CPython 2.7 runtime from 40250 pack/assets"
+    },
+    "Sandbox.execfile": {
+      "status": "RUN_AS_IS",
+      "impl": [
+        "assets/root/utils.py:Sandbox.execfile"
+      ],
+      "evidence": "executed directly by embedded CPython 2.7 runtime from 40250 pack/assets"
+    }
+  }
+}