feat(gui): implement first-run setup wizard (1b-8) (#24)

* feat(gui): implement first-run setup wizard (1b-8)

Add a 5-step setup wizard that replaces the single-step /setup:
1. Create Operator - create initial operator account
2. System Settings - configure map tile URL and attribution
3. API Keys - optionally add API keys for adapters
4. Configure Adapters - enable/disable adapters with region picker
5. Finish Setup - review and complete setup

Key changes:
- Update middleware to handle wizard URL structure and step routing
- Add wizard routes for each step with proper auth checks
- Create new templates using base_wizard.html for consistent styling
- Add audit events for system.update and setup.complete
- Update tests for new middleware behavior

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(gui): handle CSRF errors on wizard paths

Update csrf_exception_handler to re-render wizard forms with error
message instead of redirecting to /login when CSRF validation fails.

- /setup/operator: re-render with error
- /setup/system: re-render with current system values + error
- /setup/keys: re-render with current keys list + error
- /setup/adapters: re-render with current adapter config + error
- /setup/finish: re-render with summary data + error
- /setup: redirect to /setup (middleware routes to appropriate step)

Add error display to setup_keys.html and setup_finish.html templates.
Add 7 new CSRF handler tests for wizard paths.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(gui): region picker render + click-to-draw

Bug A: Maps render blank on /setup/adapters for FIRMS and USGS
because Leaflet computed zero dimensions before container layout
settled. Fix: add setTimeout invalidateSize() after map creation.

Bug B: No click-to-draw functionality - only drag corners. Fix:
add L.Control.Draw for rectangle drawing with CREATED event handler
to replace existing rectangle.

Both fixes applied to:
- setup_adapters.html (wizard inline JS)
- _region_picker.html (standalone edit page)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(gui): handle revisiting /setup/operator after operator created

When an operator already exists, /setup/operator now shows a
confirmation page instead of the create form. This prevents:
- Unique constraint violations on duplicate username
- Silent creation of duplicate operators

GET /setup/operator: queries config.operators; if any exist,
renders confirmation state with existing_operator context.

POST /setup/operator: checks operator count before INSERT; if
non-zero, renders confirmation state without inserting.

Template updated with conditional to show "Operator Already
Configured" message when existing_operator is set.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(csrf): replace fastapi-csrf-protect with session-bound CSRF

Fixes CSRF race condition where every GET rotated the CSRF token,
causing POST failures when users had multiple tabs or slow connections.

Changes:
- Remove fastapi-csrf-protect dependency
- Add session-bound CSRF tokens stored in config.sessions table
- Add pre-auth CSRF for unauthenticated routes (/login, /setup/operator)
- Add csrf.py module for pre-auth token generation/validation
- Update routes to use new CSRF token handling
- Add migration 013 to add csrf_token column to sessions

The session-bound approach ensures CSRF tokens remain stable for the
duration of a session, eliminating the race condition.

Note: Route tests (test_wizard.py, test_adapters.py, etc.) need
refactoring to mock get_settings() instead of CsrfProtect dependency.
Core auth/CSRF handler tests pass (74 tests).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test(csrf): update test suite for session-bound CSRF tokens

- Add CSRF fixtures to conftest.py for pre-auth and session CSRF
- Update test_wizard.py: use bypass_pre_auth_csrf and patch_route_settings
- Update test_adapters.py: set request.state.csrf_token and form mock data
- Update test_api_keys.py: add CSRF token to form data for POST routes
- Update test_streams.py: change return_value to side_effect for CSRF support
- Update test_region_picker.py: add CSRF token handling
- Update test_config_store.py: set CENTRAL_CSRF_SECRET env var in fixture

All 285 tests now pass with session-bound CSRF validation.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Matt Johnson <mj@k7zvx.com>

tests/conftest.py

@@ -48,3 +48,49 @@ def mock_conn():
     conn.fetchval = AsyncMock()
     conn.execute = AsyncMock()
     return conn
+
+
+# CSRF fixtures for route tests
+
+@pytest.fixture
+def bypass_pre_auth_csrf():
+    """Patch pre-auth CSRF validation to always pass.
+    
+    Use for tests of pre-auth routes: /login, /setup/operator
+    """
+    with patch("central.gui.routes.validate_pre_auth_csrf", return_value=True):
+        with patch("central.gui.routes.generate_pre_auth_csrf", return_value=("test_csrf_token", "test_signed_token")):
+            yield
+
+
+@pytest.fixture
+def bypass_session_csrf():
+    """Create a mock request with session CSRF properly configured.
+    
+    Use for tests of authenticated routes that check request.state.csrf_token.
+    Returns a configured mock_request.
+    """
+    request = MagicMock()
+    request.state.csrf_token = "test_csrf_token_12345"
+    request.state.operator = MagicMock()
+    request.state.operator.id = 1
+    request.state.operator.username = "testuser"
+    
+    # Mock form() to return dict with matching CSRF token
+    form_data = {"csrf_token": "test_csrf_token_12345"}
+    
+    async def mock_form():
+        return form_data
+    
+    request.form = mock_form
+    request._form_data = form_data  # Allow tests to modify form data
+    
+    return request
+
+
+@pytest.fixture
+def patch_route_settings():
+    """Patch get_settings in routes module."""
+    with patch("central.gui.routes.get_settings") as mock:
+        mock.return_value.csrf_secret = "test-csrf-secret-for-testing-only-32chars"
+        yield mock