Allow Docker and other runtime environments to inject JSON request parameters for suffixed custom models so provider-specific defaults like NVIDIA NIM thinking flags persist outside the UI. Add parsing, sanitization, tests, and docs for the new VITE_CUSTOM_API_PARAMS_<suffix> flow.
Use images/logo/1024-1024.svg as the source of truth and regenerate desktop/web/extension/docs icon assets with a consistent rounded alpha mask. Refs #211.
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