test(routes): cover remaining HTTP endpoints and switch to integration marker

[x3ek]

Closes #98

45 new integration tests (suite 365 to 410), written after auditing what already existed so nothing is duplicated:

• New tests/test_routes_public.py (18): health, root redirect, feed end-to-end with draft exclusion, sitemap with hidden-page and draft exclusion, robots, favicon found and missing, user-static extension gating, theme-static real file, default fallback, invalid theme 400, traversal 400, missing 404
• New tests/test_routes_auth.py (10): login redirect with OAuth params, unconfigured OAuth, dev bypass, callback error/missing-code/bad-state, logout, /auth/me anonymous vs seeded session (token-exchange happy path intentionally out, would need GitHub endpoint mocking, noted in the module docstring)
• Extended tests/test_routes_admin.py (12): /admin/analytics auth and shape, full-stack notes CRUD over HTTP with CSRF, HTMX partials, 401/403/404/422 paths

Also resolves the deferred conftest decision from #91: module-name gating replaced with a registered @pytest.mark.integration marker (self-declaring per module, no conftest edit for future modules, strict-markers catches typos), plus a fake_github fixture for tests that mutate content mid-test.

No source changes; no bugs found. One note: /auth/login redirects 307 (FastAPI RedirectResponse default), the issue text said 302; tests assert the actual behavior.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds broad HTTP integration coverage for previously untested endpoint groups and updates the integration-test harness to opt in via a pytest marker instead of a hardcoded module allowlist.

Changes:

• Added new integration test modules covering public utility endpoints and OAuth auth routes.
• Extended admin integration tests to cover /admin/analytics and full-stack notes CRUD + HTMX partials.
• Switched integration gating in tests/conftest.py from a module-name list to @pytest.mark.integration, and registered the marker in pytest config.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/conftest.py	Switches env pinning + FakeGitHubService injection to marker-based opt-in; adds fake_github fixture.
pyproject.toml	Registers the integration marker for pytest.
tests/test_routes_public.py	New end-to-end coverage for health, root redirect, feed, sitemap/robots, favicon, and static routes.
tests/test_routes_auth.py	New end-to-end coverage for OAuth login/callback/logout/me flows (excluding token exchange).
tests/test_routes_admin.py	Adds integration coverage for analytics and notes CRUD + HTMX partial endpoints.
tests/test_routes_posts.py	Marks existing integration module with pytestmark = pytest.mark.integration.
tests/test_routes_pages.py	Marks existing integration module with pytestmark = pytest.mark.integration.
tests/test_routes_webhooks.py	Marks existing integration module with pytestmark = pytest.mark.integration.
tests/test_routes_search.py	Marks existing integration module with pytestmark = pytest.mark.integration.