debug(gemini): log raw API response on the server

vibn-frontend/lib/ai/gemini-chat.ts

@@ -133,6 +133,11 @@ export async function callGeminiChat(opts: {
       config,
     });
 
+    console.log(
+      "[GeminiChat] Raw Response:",
+      JSON.stringify(response, null, 2),
+    );
+
     let text = "";
     let thoughts = "";
     const toolCalls: ToolCall[] = [];
@@ -205,6 +210,8 @@ export async function* streamGeminiChat(opts: {
       config,
     });
 
+    console.log("[GeminiChat] Stream request initiated");
+
     for await (const chunk of streamResult) {
       const parts = chunk.candidates?.[0]?.content?.parts ?? [];
       for (const part of parts) {