Initial commit: investment dashboard with contributions panel and forecast chart

React + Vite frontend with a local-JSON-backed API (Vite middleware) for
tracking portfolio holdings, contributions/withdrawals, recurring
contribution plans, and a forecast chart comparing the portfolio's real
value against a same-contributions S&P 500 benchmark.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.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?