test: add initial Cypress e2e test infrastructure

Smoke tests for verifying Cypress runs, plus basic API tests
for health and sessions endpoints.

cypress.config.js

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+const { defineConfig } = require('cypress');
+
+module.exports = defineConfig({
+    e2e: {
+        supportFile: 'cypress/support/e2e.js',
+        specPattern: 'cypress/e2e/**/*.cy.{js,ts}',
+        defaultCommandTimeout: 10000,
+        requestTimeout: 10000,
+        video: false,
+        screenshotOnRunFailure: true,
+    },
+});

cypress/e2e/api/health.cy.js

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+/// <reference types="cypress" />
+
+describe('Session Manager API', () => {
+    describe('Health Check', () => {
+        it('should respond to the health endpoint', () => {
+            cy.request({
+                method: 'GET',
+                url: '/api/health',
+                failOnStatusCode: false,
+            }).then((response) => {
+                // The endpoint should exist and return a response
+                expect(response.status).to.be.oneOf([200, 503]);
+                expect(response.body).to.be.an('object');
+            });
+        });
+    });
+
+    describe('Sessions API', () => {
+        it('should list sessions', () => {
+            cy.request({
+                method: 'GET',
+                url: '/api/sessions',
+                failOnStatusCode: false,
+            }).then((response) => {
+                expect(response.status).to.eq(200);
+                expect(response.body).to.be.an('object');
+            });
+        });
+    });
+});

cypress/e2e/smoke.cy.js

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+/// <reference types="cypress" />
+
+/**
+ * Smoke test to verify that the Cypress test infrastructure is
+ * correctly installed and configured. These tests do NOT require
+ * the lovdata-chat stack to be running.
+ */
+describe('Cypress Infrastructure Smoke Test', () => {
+    it('should execute a basic assertion', () => {
+        expect(true).to.be.true;
+    });
+
+    it('should handle arrays and objects', () => {
+        const session = {
+            id: 'test-session-001',
+            status: 'running',
+            model: 'opencode/kimi-k2.5-free',
+        };
+
+        expect(session).to.have.property('id');
+        expect(session.status).to.eq('running');
+        expect(session.model).to.include('kimi');
+    });
+
+    it('should validate the allowed models whitelist structure', () => {
+        const allowedModels = [
+            {
+                id: 'opencode/kimi-k2.5-free',
+                display_name: 'Kimi K2.5',
+                provider: 'zen',
+                is_reasoning: false,
+                is_default: true,
+            },
+            {
+                id: 'anthropic/claude-sonnet-4-thinking',
+                display_name: 'Claude Sonnet 4 (Thinking)',
+                provider: 'zen',
+                is_reasoning: true,
+                thinking_budget_default: 10000,
+                thinking_budget_max: 50000,
+            },
+        ];
+
+        expect(allowedModels).to.have.length(2);
+
+        const defaultModel = allowedModels.find((m) => m.is_default);
+        expect(defaultModel).to.exist;
+        expect(defaultModel.id).to.eq('opencode/kimi-k2.5-free');
+
+        const reasoningModels = allowedModels.filter((m) => m.is_reasoning);
+        expect(reasoningModels).to.have.length(1);
+        expect(reasoningModels[0]).to.have.property('thinking_budget_default');
+        expect(reasoningModels[0]).to.have.property('thinking_budget_max');
+        expect(reasoningModels[0].thinking_budget_max).to.be.greaterThan(
+            reasoningModels[0].thinking_budget_default
+        );
+    });
+});

cypress/support/e2e.js

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+// Cypress E2E support file
+// Add custom commands and global hooks here
+
+// Prevent Cypress from failing on uncaught exceptions from the app
+Cypress.on('uncaught:exception', () => false);

package.json

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+{
+  "name": "lovdata-chat",
+  "version": "1.0.0",
+  "description": "A web-based chat interface that allows users to interact with Large Language Models (LLMs) equipped with Norwegian legal research tools from the Lovdata MCP server.",
+  "main": "index.js",
+  "directories": {
+    "doc": "docs"
+  },
+  "scripts": {
+    "test": "cypress run",
+    "cypress:open": "cypress open",
+    "cypress:run": "cypress run"
+  },
+  "repository": {
+    "type": "git",
+    "url": "ssh://git@gitea.torbjorn.org:2222/torbjorn/lovdata-chat.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "cypress": "^15.10.0"
+  }
+}