fix: auto-run Prisma migrations on deployment

Added automatic migration steps to package.json:
- build: Now runs `prisma generate` to create Prisma Client
- start: Now runs `prisma migrate deploy` before starting server

This ensures database schema is automatically set up on Railway/Render
deployments. Without this, the app would crash with "table does not exist"
errors because migrations were never run.

Fixes 500 errors on auth endpoints due to missing database tables.

Author: scotty595

package.json

@@ -11,8 +11,8 @@
   },
   "scripts": {
     "dev": "tsx watch --clear-screen=false src/server.ts",
-    "build": "tsup",
-    "start": "node dist/server.js",
+    "build": "tsup && prisma generate",
+    "start": "prisma migrate deploy && node dist/server.js",
     "test": "vitest",
     "test:ui": "vitest --ui",
     "test:coverage": "vitest --coverage",