feat(postgres): infrastructure setup and schema creation (tasks 1-2)

- Install pg (node-postgres) dependency
- Create backend/db.js connection pool module (max 10, auto-reconnect)
- Install Docker and spin up steam-postgres container on port 5433
- Create backend/db-schema.sql with complete Postgres DDL (24 tables)
- Replace findings_json blob with ivanti_findings table (individual rows)
- Merge notes/overrides into findings table columns
- Add proper indexes: state, bu_ownership, severity, composite
- Create backend/setup-postgres.js for idempotent schema initialization
- Add DATABASE_URL to .env and .env.example
- Update migration plan docs with Docker setup commands
- Verify: schema executes cleanly, pool connects, 24 tables created

package.json

@@ -2,15 +2,13 @@
   "name": "cve-dashboard",
   "version": "1.0.0",
   "description": "STEAM Security Dashboard — vulnerability management for NTS-AEO",
-  "author": "Jordan Ramos <jordan.ramos@spectrum.com>",
-  "license": "UNLICENSED",
+  "author": "",
+  "license": "ISC",
   "private": true,
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
-  "author": "",
-  "license": "ISC",
   "dependencies": {
     "bcryptjs": "^3.0.3",
     "cookie-parser": "^1.4.7",
@@ -19,6 +17,7 @@
     "express": "^5.2.1",
     "express-rate-limit": "^7.5.0",
     "multer": "^2.0.2",
+    "pg": "^8.20.0",
     "sqlite3": "^5.1.7"
   },
   "devDependencies": {