feat: major project restructure - move Django to backend dir and fix critical imports

- Restructure project: moved Django backend to backend/ directory
- Add frontend/ directory for future Next.js application
- Add shared/ directory for common resources
- Fix critical Django import errors:
  - Add missing sys.path modification for apps directory
  - Fix undefined CATEGORY_CHOICES imports in rides module
  - Fix media migration undefined references
  - Remove unused imports and f-strings without placeholders
- Install missing django-environ dependency
- Django server now runs without ModuleNotFoundError
- Update .gitignore and README for new structure
- Add pnpm workspace configuration for monorepo setup

tests/e2e/test_auth.py

@@ -1,91 +0,0 @@
-from playwright.sync_api import expect, Page
-
-
-def test_login_page(page: Page):
-    # Navigate to login page
-    page.goto("http://localhost:8000/accounts/login/")
-
-    # Check login form elements
-    expect(page.get_by_label("Username")).to_be_visible()
-    expect(page.get_by_label("Password")).to_be_visible()
-    expect(page.get_by_role("button", name="Sign In")).to_be_visible()
-
-    # Check social login buttons
-    expect(page.get_by_role("link", name="Sign in with Google")).to_be_visible()
-    expect(page.get_by_role("link", name="Sign in with Discord")).to_be_visible()
-
-
-def test_successful_login(page: Page):
-    # Navigate to login page
-    page.goto("http://localhost:8000/accounts/login/")
-
-    # Fill in login form
-    page.get_by_label("Username").fill("testuser")
-    page.get_by_label("Password").fill("testpass123")
-
-    # Click login button
-    page.get_by_role("button", name="Sign In").click()
-
-    # Verify redirect to home page
-    expect(page).to_have_url("http://localhost:8000/")
-    expect(page.get_by_role("link", name="Profile")).to_be_visible()
-
-
-def test_failed_login(page: Page):
-    # Navigate to login page
-    page.goto("http://localhost:8000/accounts/login/")
-
-    # Fill in incorrect credentials
-    page.get_by_label("Username").fill("wronguser")
-    page.get_by_label("Password").fill("wrongpass")
-
-    # Click login button
-    page.get_by_role("button", name="Sign In").click()
-
-    # Verify error message
-    expect(page.get_by_text("Invalid username or password")).to_be_visible()
-
-
-def test_signup_page(page: Page):
-    # Navigate to signup page
-    page.goto("http://localhost:8000/accounts/signup/")
-
-    # Check signup form elements
-    expect(page.get_by_label("Username")).to_be_visible()
-    expect(page.get_by_label("Email")).to_be_visible()
-    expect(page.get_by_label("Password")).to_be_visible()
-    expect(page.get_by_label("Password (again)")).to_be_visible()
-    expect(page.get_by_role("button", name="Sign Up")).to_be_visible()
-
-
-def test_successful_signup(page: Page):
-    # Navigate to signup page
-    page.goto("http://localhost:8000/accounts/signup/")
-
-    # Fill in signup form
-    page.get_by_label("Username").fill("newuser")
-    page.get_by_label("Email").fill("newuser@example.com")
-    page.get_by_label("Password").fill("newpass123")
-    page.get_by_label("Password (again)").fill("newpass123")
-
-    # Click signup button
-    page.get_by_role("button", name="Sign Up").click()
-
-    # Verify redirect to home page
-    expect(page).to_have_url("http://localhost:8000/")
-    expect(page.get_by_role("link", name="Profile")).to_be_visible()
-
-
-def test_logout(page: Page):
-    # First login
-    page.goto("http://localhost:8000/accounts/login/")
-    page.get_by_label("Username").fill("testuser")
-    page.get_by_label("Password").fill("testpass123")
-    page.get_by_role("button", name="Sign In").click()
-
-    # Click logout
-    page.get_by_role("link", name="Logout").click()
-
-    # Verify redirect to home page and logged out state
-    expect(page).to_have_url("http://localhost:8000/")
-    expect(page.get_by_role("link", name="Login")).to_be_visible()