chore: establish TypeScript monorepo foundation

.env.example

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+NODE_ENV=development
+PORT=3001
+DATABASE_URL=./data/tech-library.db
+WEB_ORIGIN=http://localhost:5173
+ADMIN_USERNAME=admin
+# Generate with: npm run password:hash -w @tech-library/api -- "your password"
+ADMIN_PASSWORD_HASH=
+SESSION_SECRET=replace-with-at-least-32-random-characters
+SOURCE_POLL_INTERVAL_HOURS=24

.gitignore

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+node_modules/
+dist/
+.vite/
+coverage/
+data/
+*.db
+*.db-shm
+*.db-wal
+.env
+.env.local
+backups/
+playwright-report/
+test-results/

package.json

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+{
+  "name": "tech-library",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "workspaces": ["apps/*", "packages/*"],
+  "scripts": {
+    "dev": "concurrently -n api,web,worker -c blue,magenta,yellow \"npm:dev -w @tech-library/api\" \"npm:dev -w @tech-library/web\" \"npm:dev -w @tech-library/worker\"",
+    "build": "npm run build -w @tech-library/contracts && npm run build -w @tech-library/database && npm run build -w @tech-library/api && npm run build -w @tech-library/worker && npm run build -w @tech-library/web",
+    "test": "npm run build -w @tech-library/contracts && npm run build -w @tech-library/database && npm run test --workspaces --if-present",
+    "typecheck": "npm run build -w @tech-library/contracts && npm run build -w @tech-library/database && npm run typecheck --workspaces --if-present",
+    "db:migrate": "npm run db:migrate -w @tech-library/database",
+    "db:seed": "npm run db:seed -w @tech-library/database",
+    "format": "prettier --write .",
+    "check": "npm run typecheck && npm test && npm run build"
+  },
+  "devDependencies": {
+    "@types/node": "^24.0.0",
+    "concurrently": "^9.2.1",
+    "prettier": "^3.6.2",
+    "typescript": "^5.9.2",
+    "vitest": "^5.0.5"
+  },
+  "engines": { "node": ">=22" }
+}

tsconfig.base.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "skipLibCheck": true,
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "declaration": true,
+    "sourceMap": true
+  }
+}