refactor : merge Inventory_frontend submodule into frontend/ directory

Merges the full git history of Inventory_frontend into the monorepo
under frontend/. Removes the submodule in favor of a unified repo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/e2e/auth.setup.ts

@@ -0,0 +1,35 @@
+import { test as setup, expect } from '@playwright/test'
+
+const AUTH_FILE = 'e2e/.auth/session.json'
+
+/**
+ * Authentication setup: selects the first available profile
+ * to establish a session cookie before running any test.
+ *
+ * The app uses a profile-based session system:
+ * - GET  /api/session/profiles  → list available profiles
+ * - POST /api/session/profile   → activate a profile (sets cookie)
+ *
+ * The global middleware (profile.global.ts) redirects to /profiles
+ * if no active profile is found.
+ */
+setup('select a profile to authenticate', async ({ page }) => {
+  // Go to the profiles page
+  await page.goto('/profiles')
+
+  // Wait for profiles to load
+  await expect(page.getByRole('heading', { name: 'Choisir un profil' })).toBeVisible({ timeout: 15_000 })
+
+  // Wait for at least one profile button to appear
+  const profileButton = page.locator('button.btn-outline').first()
+  await expect(profileButton).toBeVisible({ timeout: 10_000 })
+
+  // Click the first available profile
+  await profileButton.click()
+
+  // Wait for redirect to home page (profile selected → session cookie set)
+  await page.waitForURL('/', { timeout: 10_000 })
+
+  // Save authenticated state (cookies + localStorage)
+  await page.context().storageState({ path: AUTH_FILE })
+})