fix: extend tool name sanitization to all remaining Gemini-bound translators

Apply SanitizeFunctionName on request and RestoreSanitizedToolName on
response for: gemini/claude, gemini/openai/chat-completions,
gemini/openai/responses, antigravity/openai/chat-completions,
gemini-cli/openai/chat-completions.

Also update SanitizedToolNameMap to handle OpenAI format
(tools[].function.name) in addition to Claude format (tools[].name).

internal/translator/gemini/claude/gemini_claude_response.go

@@ -27,6 +27,7 @@ type Params struct {
 	ResponseIndex    int
 	HasContent       bool // Tracks whether any content (text, thinking, or tool use) has been output
 	ToolNameMap      map[string]string
+	SanitizedNameMap map[string]string
 	SawToolCall      bool
 }
 
@@ -57,6 +58,7 @@ func ConvertGeminiResponseToClaude(_ context.Context, _ string, originalRequestR
 			ResponseType:     0,
 			ResponseIndex:    0,
 			ToolNameMap:      util.ToolNameMapFromClaudeRequest(originalRequestRawJSON),
+			SanitizedNameMap: util.SanitizedToolNameMap(originalRequestRawJSON),
 			SawToolCall:      false,
 		}
 	}
@@ -167,6 +169,7 @@ func ConvertGeminiResponseToClaude(_ context.Context, _ string, originalRequestR
 				// This processes tool usage requests and formats them for Claude API compatibility
 				(*param).(*Params).SawToolCall = true
 				upstreamToolName := functionCallResult.Get("name").String()
+				upstreamToolName = util.RestoreSanitizedToolName((*param).(*Params).SanitizedNameMap, upstreamToolName)
 				clientToolName := util.MapToolName((*param).(*Params).ToolNameMap, upstreamToolName)
 
 				// FIX: Handle streaming split/delta where name might be empty in subsequent chunks.
@@ -260,6 +263,7 @@ func ConvertGeminiResponseToClaudeNonStream(_ context.Context, _ string, origina
 
 	root := gjson.ParseBytes(rawJSON)
 	toolNameMap := util.ToolNameMapFromClaudeRequest(originalRequestRawJSON)
+	sanitizedNameMap := util.SanitizedToolNameMap(originalRequestRawJSON)
 
 	out := []byte(`{"id":"","type":"message","role":"assistant","model":"","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":0,"output_tokens":0}}`)
 	out, _ = sjson.SetBytes(out, "id", root.Get("responseId").String())
@@ -315,6 +319,7 @@ func ConvertGeminiResponseToClaudeNonStream(_ context.Context, _ string, origina
 				hasToolCall = true
 
 				upstreamToolName := functionCall.Get("name").String()
+				upstreamToolName = util.RestoreSanitizedToolName(sanitizedNameMap, upstreamToolName)
 				clientToolName := util.MapToolName(toolNameMap, upstreamToolName)
 				toolIDCounter++
 				toolBlock := []byte(`{"type":"tool_use","id":"","name":"","input":{}}`)