Stop auto-seeding 6 chat-centric extensions on startup. Move them to
standard packages with js/ layout and "requires": ["chat"] metadata.
Delete SeedBuiltinPackages, seed tests, Dockerfile COPY, and
extensions/builtin/ directory.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- nginx.conf → nginx.conf.template with ${BASE_PATH} in all locations
- NGINX_ENVSUBST_FILTER=BASE_PATH so nginx vars ($host, $uri) are preserved
- Entrypoint injects BASE_PATH into frontend HTML/JS (%%BASE_PATH%% → actual)
- Fixes: /test routes falling through to static SPA, %%BASE_PATH%% visible in URL
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
