feat: sync deployed v1.0.0-rc.38-custom.42

Sync production source including routing, billing, Astra detection and public uptime. Update custom build instructions and license packaging.

relaykit/dto/claude.go

@@ -246,6 +246,8 @@ type ClaudeRequest struct {
 	Thinking          *Thinking       `json:"thinking,omitempty"`
 	McpServers        json.RawMessage `json:"mcp_servers,omitempty"`
 	Metadata          json.RawMessage `json:"metadata,omitempty"`
+	// vLLM Messages extension; forwarded verbatim when present.
+	ChatTemplateKwargs json.RawMessage `json:"chat_template_kwargs,omitempty"`
 	// Speed specifies the Claude inference speed mode.
 	// This field is filtered by default and can be enabled via channel setting allow_speed.
 	Speed json.RawMessage `json:"speed,omitempty"`