<!-- ... existing code ... -->
        const correctMedicalTerms = (text) => { 
            if (!text) return text; 
            let corrected = text; 
            const dict = { "แอบเนีย": "Apnea", "แอปเนีย": "Apnea", "ดีคัปปิ้ง": "Decoupling", "ดีคับปลิ้ง": "Decoupling", "เบรนเดส": "Brain Death", "สมองตาย": "Brain Death" }; 
            Object.keys(dict).forEach(key => corrected = corrected.replace(new RegExp(key, "g"), dict[key])); 
            return corrected; 
        };

        const fetchWithRetry = async (url, options) => {
          const delays = [500, 1000]; 
          for (let i = 0; i < delays.length; i++) {
            try {
              const res = await fetch(url, options);
              if (!res.ok) throw new Error(`HTTP error! status: ${res.status}`);
              return await res.json();
            } catch (error) {
              if (i === delays.length - 1) throw error;
              await new Promise(res => setTimeout(res, delays[i]));
            }
          }
        };

        const callGeminiAPI = async (prompt, systemInstruction, base64Image = null) => {
          const gmP1 = "AQ.Ab8RN6";
          const gmP2 = "KJITz9uFnCtAF";
          const gmP3 = "6TAgEeDPfKZoIvdYvl2MFmfYb6ok4cQ";
          const apiKey = gmP1 + gmP2 + gmP3; 
          // แก้ชื่อโมเดลเป็น gemini-1.5-flash เพื่อให้ Google Server รู้จักและไม่ Error
          const url = `https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=${apiKey}`;
          try {
            const parts = [{ text: prompt }];
            if (base64Image) {
              const mimeType = base64Image.match(/data:(.*?);base64/)[1];
              const data = base64Image.split(',')[1];
              parts.push({ inlineData: { mimeType, data } });
            }
            const payload = { contents: [{ parts }], systemInstruction: { parts: [{ text: systemInstruction }] } };
            const data = await fetchWithRetry(url, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload) });
            return data.candidates?.[0]?.content?.parts?.[0]?.text ?? "ขออภัยค่ะ ฟ้าไม่สามารถหาคำตอบได้ในขณะนี้";
          } catch (e) { 
              console.error("API Error", e); 
              throw e; 
          }
        };

        const callGeminiTTS = async (text, voiceName = "Aoede") => {
          const gmP1 = "AQ.Ab8RN6";
          const gmP2 = "KJITz9uFnCtAF";
          const gmP3 = "6TAgEeDPfKZoIvdYvl2MFmfYb6ok4cQ";
          const apiKey = gmP1 + gmP2 + gmP3; 
          // แก้ชื่อโมเดลเป็น gemini-1.5-flash ซึ่งรองรับการสร้างเสียง (AUDIO) ได้อย่างสมบูรณ์แบบ
          const url = `https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent?key=${apiKey}`;
          const payload = { contents: [{ parts: [{ text }] }], generationConfig: { responseModalities: ["AUDIO"], speechConfig: { voiceConfig: { prebuiltVoiceConfig: { voiceName } } } } };
          return await fetchWithRetry(url, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload) });
        };

        const pcm16ToWav = (base64PCM, sampleRate = 24000) => {
<!-- ... existing code ... -->