feat: scaffold character sheet generator with multi-game support

- Set up Vite + React + TypeScript + Tailwind v4 + React Router v7
- Implement pluggable GameModule architecture for multiple RPG systems
- Add Mothership, Mothership Karth, and Mythic Bastionland game modules
- Create A5 sheet (148x210mm) and A4 print layout (landscape, 2-up)
- Add print flow via iframe with proper @page A4 sizing
- Add game selector home page and per-game editor with live preview

.gitignore

@@ -0,0 +1,24 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?