**feat(translator): add Antigravity translation logic**

- Introduced request and response translation functions to enable compatibility between OpenAI Chat Completions API and Antigravity.
- Registered translation utilities for both streaming and non-streaming scenarios.
- Added support for reasoning content, tool calls, and metadata handling.
- Established request normalization and embedding for Antigravity-compatible payloads.
- Added new fields to `Params` struct for better tracking of finish reasons, usage metadata, and tool usage.
- Refactored handling of response transitions, final events, and state-driven logic in `ConvertAntigravityResponseToClaude`.
- Introduced `appendFinalEvents` and `resolveStopReason` helper functions for cleaner separation of concerns.
- Added `TotalTokenCount` field to `Params` struct for enhanced token tracking.
- Updated token count calculations to fallback on `TotalTokenCount` when specific counts are missing.
- Introduced `hasNonZeroUsageMetadata` function to validate presence of token data in `usage_metadata`.

internal/translator/antigravity/openai/responses/antigravity_openai-responses_response.go

@@ -0,0 +1,35 @@
+package responses
+
+import (
+	"context"
+
+	. "github.com/router-for-me/CLIProxyAPI/v6/internal/translator/gemini/openai/responses"
+	"github.com/tidwall/gjson"
+)
+
+func ConvertAntigravityResponseToOpenAIResponses(ctx context.Context, modelName string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) []string {
+	responseResult := gjson.GetBytes(rawJSON, "response")
+	if responseResult.Exists() {
+		rawJSON = []byte(responseResult.Raw)
+	}
+	return ConvertGeminiResponseToOpenAIResponses(ctx, modelName, originalRequestRawJSON, requestRawJSON, rawJSON, param)
+}
+
+func ConvertAntigravityResponseToOpenAIResponsesNonStream(ctx context.Context, modelName string, originalRequestRawJSON, requestRawJSON, rawJSON []byte, param *any) string {
+	responseResult := gjson.GetBytes(rawJSON, "response")
+	if responseResult.Exists() {
+		rawJSON = []byte(responseResult.Raw)
+	}
+
+	requestResult := gjson.GetBytes(originalRequestRawJSON, "request")
+	if responseResult.Exists() {
+		originalRequestRawJSON = []byte(requestResult.Raw)
+	}
+
+	requestResult = gjson.GetBytes(requestRawJSON, "request")
+	if responseResult.Exists() {
+		requestRawJSON = []byte(requestResult.Raw)
+	}
+
+	return ConvertGeminiResponseToOpenAIResponsesNonStream(ctx, modelName, originalRequestRawJSON, requestRawJSON, rawJSON, param)
+}