Initial scaffold: Nakama backend, Godot client, content schema

Sets up the Step 1 (Project Foundation) and Step 2 (Content Schemas) scaffold
from the implementation sequence. Includes Docker Compose stack, Nakama
TypeScript module stubs, PostgreSQL migration, Godot 4 project shell with
scene stubs and NakamaClient singleton, YAML content schemas for all entity
types, and example data for 3 characters, 2 jobs, and all 7 core resources.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,25 @@
+# Environment
+.env
+*.env.local
+
+# Godot
+godot/.godot/
+godot/export/
+*.import
+*.translation
+
+# Python
+__pycache__/
+*.pyc
+.venv/
+venv/
+
+# Node / TypeScript (Nakama modules build output)
+nakama/node_modules/
+nakama/dist/
+nakama/*.js
+!nakama/modules/*.js
+
+# OS
+.DS_Store
+Thumbs.db