Initial commit — options pricing dashboard

Full-stack options analytics app: IV surface, Greeks, skew metrics,
vol term structure. Yahoo Finance data with Black-Scholes IV computation
and historical vol fallback for after-hours data.

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

backend/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "types": ["node"],
+    "paths": {}
+  },
+  "include": ["src/**/*.ts"]
+}