feat(F-002): database foundation with migrations and dev compose

- node-pg-migrate + pg: baseline migration (extensions, app_meta) with working down
- src/infrastructure/db fail-fast pool and typed query helper
- docker-compose: postgres:16-alpine + redis:7-alpine with one-command up
- table naming convention <module>_<table> documented in README
- integration tests (6) against real PostgreSQL; strict identifier validation
  for test DDL after security-gate hardening round
- deps justified in spec/tech.md; all gates approved; verify.sh green

project/package.json

@@ -13,13 +13,22 @@
     "lint": "eslint . && prettier --check .",
     "lint:boundaries": "node scripts/check-module-boundaries.mjs src",
     "typecheck": "tsc -p tsconfig.json --noEmit",
-    "test": "vitest run"
+    "test": "vitest run",
+    "test:integration": "node --env-file-if-exists=.env node_modules/vitest/vitest.mjs run itest",
+    "docker:up": "docker compose up -d --wait",
+    "docker:down": "docker compose down",
+    "db:up": "node --env-file-if-exists=.env node_modules/node-pg-migrate/bin/node-pg-migrate.js up --migrations-dir migrations",
+    "db:down": "node --env-file-if-exists=.env node_modules/node-pg-migrate/bin/node-pg-migrate.js down --migrations-dir migrations",
+    "db:status": "node --env-file-if-exists=.env scripts/db-status.mjs"
   },
   "dependencies": {
-    "fastify": "^5.2.0"
+    "fastify": "^5.2.0",
+    "node-pg-migrate": "^9.0.0",
+    "pg": "^8.23.0"
   },
   "devDependencies": {
     "@eslint/js": "^9.17.0",
+    "@types/pg": "^8.21.0",
     "eslint": "^9.17.0",
     "eslint-config-prettier": "^10.0.0",
     "prettier": "^3.4.0",