feat: add profile screen and update routing; enhance login validation and logout functionality

flutter/README.md

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+# Flutter Frontend - User Guide
+
+This README describes how to use the Flutter frontend for Recipe App from a user and operator perspective.
+
+Related documents:
+- [next_steps_flutter.md](../next_steps_flutter.md)
+- [teknisk_beskrivning_flutter.md](../teknisk_beskrivning_flutter.md)
+
+## What this app is
+This is a Flutter Web frontend for Recipe App, served in Docker and exposed through Caddy.
+It is intended to behave like the existing web frontend, but built in Flutter to support future Android and iOS clients.
+
+## Current user flows
+- Login with username and password.
+- Recipe list view after login.
+- Profile page (base version).
+- Logout from recipe/profile pages.
+
+## Where to access it
+- Test environment: `https://test.gynther.se`
+
+## Login details
+- Login expects username, not email.
+- Example seeded admin user in backend bootstrap: `Nadmin`.
+- Password is controlled by server environment variable (`ADMIN_NADMIN_PASSWORD`).
+
+## Known current scope
+This is an active migration track. Not all pages from the existing frontend are moved yet.
+Planned migration sequence is documented in [next_steps_flutter.md](../next_steps_flutter.md).
+
+## Troubleshooting (user level)
+1. If page shows old behavior after deploy: hard refresh or open in incognito.
+2. If login fails: verify username/password (not email).
+3. If recipes do not load: report browser console/network errors to the dev team.
+
+## Release expectation
+This frontend is available for iterative testing. Feature parity with the current production frontend is delivered step by step.