refactor(db): switch records layer to Prisma

- Replace hand-written node:sqlite queries with a Prisma client using
  the better-sqlite3 driver adapter
- Version the schema with migrations: baseline table, timestamp
  normalisation, and WAL journal mode
- Store timestamps with an explicit UTC offset so they stop being parsed
  as local time
- Show created/updated times on the edit page, formatted with dayjs
- Move the root redirect into next.config to avoid a prerender error
- Run migrations from the container entrypoint before starting the server

BREAKING CHANGE: DNSMASQ_ADMIN_DB_PATH is replaced by DATABASE_URL, which
must be a Prisma connection URL (file:./data/dnsmasq-admin.db). Existing
database files are migrated in place and need no conversion.

package.json

@@ -3,12 +3,17 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "next dev",
-    "build": "next build",
+    "dev": "prisma generate && next dev",
+    "build": "prisma generate && next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "db:generate": "prisma generate",
+    "db:migrate": "prisma migrate deploy"
   },
   "dependencies": {
+    "@prisma/adapter-better-sqlite3": "7.10.0",
+    "@prisma/client": "^7.10.0",
+    "dayjs": "^1.11.23",
     "next": "16.4.0",
     "react": "19.3.0",
     "react-dom": "19.3.0"
@@ -18,9 +23,11 @@
     "@types/node": "24",
     "@types/react": "^19",
     "@types/react-dom": "^19",
+    "dotenv": "^18.0.6",
     "eslint": "^9",
     "eslint-config-next": "16.4.0",
     "prettier": "^3.9.9",
+    "prisma": "7.10.0",
     "tailwindcss": "^4",
     "typescript": "^5"
   },