feat: initialize monorepo with full dev team best practices

- Unified monorepo with backend (Express), frontend (Next.js), and devops
- Backend: ESLint, Prettier, Jest tests (3 passing), health endpoint, .env.example
- Frontend: Fixed build errors, fixed all lint errors (0 remaining), tests passing
- DevOps: Docker Compose with PostgreSQL, backend, frontend + healthchecks
- CI/CD: 3 GitHub Actions workflows (backend, frontend, docker integration)
- DX: Husky pre-commit hooks with smart change detection
- Docs: Root README with architecture, CONTRIBUTING.md, PR template

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

website-monitoring-backend/eslint.config.mjs

@@ -0,0 +1,23 @@
+import eslint from "@typescript-eslint/eslint-plugin";
+import parser from "@typescript-eslint/parser";
+
+export default [
+  {
+    files: ["src/**/*.ts"],
+    languageOptions: {
+      parser,
+      parserOptions: {
+        ecmaVersion: 2022,
+        sourceType: "module",
+      },
+    },
+    plugins: {
+      "@typescript-eslint": eslint,
+    },
+    rules: {
+      "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
+      "@typescript-eslint/no-explicit-any": "warn",
+      "no-console": "off",
+    },
+  },
+];