fix(security): harden auth, upload, and API configuration

- Lock public registration to first-user bootstrap (403 afterwards)
- Require JwtAuthGuard on upload + whitelist png/jpg/webp/gif (SVG/XSS blocked)
- Add global throttling (login/register 5/min, upload 10/min)
- Add helmet security headers; serve uploads with nosniff
- Replace permissive CORS (origin:true+credentials) with CORS_ORIGINS whitelist
- Disable Swagger outside development; sanitize 500 error responses
- Enforce 32+ char JWT_SECRET; make token expiry configurable (TOKEN_EXPIRES_IN)
- Re-check user in DB on every JWT validation (revocation on user delete)
- Dummy bcrypt compare to prevent login user-enumeration via timing
- Map malformed BigInt inputs to 400 instead of 500
- Widen .gitignore to .env* and add apps/api/.env.example
- Disable Nuxt devtools and sourcemaps

apps/api/.env.example

@@ -0,0 +1,17 @@
+# Prisma connection string (PostgreSQL)
+DATABASE_URL=postgresql://postgres:CHANGE_ME@localhost:5432/inkreach-official-website
+
+# JWT signing secret: generate with `node -e "console.log(require('crypto').randomBytes(48).toString('hex'))"`
+# Must be at least 32 characters.
+JWT_SECRET=CHANGE_ME_TO_A_STRONG_RANDOM_SECRET
+
+# Access token lifetime (jwt-rest compatible, e.g. 30m, 12h, 7d)
+TOKEN_EXPIRES_IN=7d
+
+# Comma-separated list of allowed CORS origins (leave empty to disable CORS)
+CORS_ORIGINS=http://localhost:5173
+
+# Global rate limit per minute (per IP)
+THROTTLE_LIMIT=120
+
+PORT=3001