Merge origin/main into nightly

Resolve conflicts:
- .gitignore: keep nightly additions (.test, skills-lock.json)
- relay/helper/price.go: keep both billingexpr and model imports
- en.json / zh-CN.json: keep nightly's superset of i18n entries
- service/billing_session.go: add missing 3rd arg to DecreaseUserQuota
- en.json / zh-CN.json: deduplicate 129+320 duplicate i18n keys

dto/gemini.go

@@ -46,6 +46,7 @@ func (r *GeminiChatRequest) UnmarshalJSON(data []byte) error {
 type ToolConfig struct {
 	FunctionCallingConfig *FunctionCallingConfig `json:"functionCallingConfig,omitempty"`
 	RetrievalConfig       *RetrievalConfig       `json:"retrievalConfig,omitempty"`
+	IncludeServerSideToolInvocations *bool       `json:"includeServerSideToolInvocations,omitempty"`
 }
 
 type FunctionCallingConfig struct {