feat: ST-001–ST-005 foundation — scaffolding, Prisma, schema, seed, env

- ST-001: Next.js 16 + React 19 + TypeScript strict + Tailwind + shadcn/ui + all deps
- ST-002: Prisma v7 setup with better-sqlite3 adapter (local) and pg adapter (cloud)
- ST-003: Full schema migration (users, pbis, stories, sprints, tasks, todos, api_tokens)
- ST-004: Seed with 9 PBIs, ~40 stories, demo user (demo/demo1234), lars user
- ST-005: Zod-validated env vars, .env.example, lib/session, lib/auth, lib/api-auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -9,18 +9,50 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@base-ui/react": "^1.4.1",
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^8.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
+    "@libsql/client": "^0.17.2",
+    "@prisma/adapter-better-sqlite3": "^7.8.0",
+    "@prisma/adapter-libsql": "^7.8.0",
+    "@prisma/adapter-pg": "^7.8.0",
+    "@prisma/client": "^7.8.0",
+    "bcryptjs": "^2.4.3",
+    "better-sqlite3": "^12.9.0",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "dotenv": "^17.4.2",
+    "iron-session": "^8.0.4",
+    "lucide-react": "^1.8.0",
     "next": "16.2.4",
+    "next-themes": "^0.4.6",
+    "pg": "^8.20.0",
+    "prisma": "^7.8.0",
     "react": "19.2.4",
-    "react-dom": "19.2.4"
+    "react-dom": "19.2.4",
+    "shadcn": "^4.4.0",
+    "sonner": "^1.7.4",
+    "tailwind-merge": "^3.5.0",
+    "tw-animate-css": "^1.4.0",
+    "zod": "^3.25.76",
+    "zustand": "^5.0.12"
+  },
+  "prisma": {
+    "seed": "tsx prisma/seed.ts"
   },
   "devDependencies": {
     "@tailwindcss/postcss": "^4",
+    "@types/bcryptjs": "^2.4.6",
+    "@types/better-sqlite3": "^7.6.13",
     "@types/node": "^20",
+    "@types/pg": "^8.20.0",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "eslint": "^9",
     "eslint-config-next": "16.2.4",
     "tailwindcss": "^4",
+    "tsx": "^4.21.0",
     "typescript": "^5"
   }
 }