tools.pi: add ollama provider with auto-discovery, fix settings reload
New extension queries /api/tags at startup and registers every model
under a single "ollama" provider via the OpenAI-compat layer. Endpoint
points at neoprism.r:11434 — reachable from retiolum via the c-base-ai
autossh tunnel.
settings-env.patch also patches SettingsManager.reload() so the
PI_SETTINGS_FILE merge survives resourceLoader.reload() — without this
the bundled extensions list was being wiped after initial load.