v5.28.4

🐛 Patch Changes

• c0cb273: Persist the selected provider for manual routing overrides so OpenRouter-sourced models resolve through the chosen provider instead of being re-inferred from the model name.
• e37c315: Fix SPA deep-route refresh returning 404 in local/embedded mode by disabling @nestjs/serve-static's broken render handler and hardening the SPA fallback filter to use cached index.html content instead of res.sendFile()
• ed066de: Trigger proxy fallbacks when the primary provider fails at the transport layer before returning an HTTP response.
• c187927: Filter phantom models from OpenRouter fallback using provider-native API data
• 7fb9ba9: Normalize Anthropic short model ids so pricing lookup resolves Claude 4.6 cost entries across dotted and dashed variants.