Update web client

docs/duplex_interaction.svg

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+  <defs>
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+      .title { font: 600 14px 'Arial'; fill:#f2f3f7; }
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+
+  <rect x="40" y="40" width="250" height="120" class="box"/>
+  <text x="60" y="70" class="title">Web Client</text>
+  <text x="60" y="95" class="text">WS JSON commands</text>
+  <text x="60" y="115" class="text">WS binary PCM audio</text>
+
+  <rect x="350" y="40" width="250" height="120" class="box"/>
+  <text x="370" y="70" class="title">FastAPI /ws</text>
+  <text x="370" y="95" class="text">Session + Transport</text>
+
+  <rect x="660" y="40" width="250" height="120" class="box"/>
+  <text x="680" y="70" class="title">DuplexPipeline</text>
+  <text x="680" y="95" class="text">process_audio / process_text</text>
+
+  <rect x="920" y="40" width="240" height="120" class="box"/>
+  <text x="940" y="70" class="title">ConversationManager</text>
+  <text x="940" y="95" class="text">turns + state</text>
+
+  <rect x="660" y="200" width="180" height="100" class="box"/>
+  <text x="680" y="230" class="title">VADProcessor</text>
+  <text x="680" y="255" class="text">speech/silence</text>
+
+  <rect x="860" y="200" width="180" height="100" class="box"/>
+  <text x="880" y="230" class="title">EOU Detector</text>
+  <text x="880" y="255" class="text">end-of-utterance</text>
+
+  <rect x="1060" y="200" width="120" height="100" class="box"/>
+  <text x="1075" y="230" class="title">ASR</text>
+  <text x="1075" y="255" class="text">transcripts</text>
+
+  <rect x="920" y="350" width="240" height="110" class="box"/>
+  <text x="940" y="380" class="title">LLM (stream)</text>
+  <text x="940" y="405" class="text">llmResponse events</text>
+
+  <rect x="660" y="350" width="220" height="110" class="box"/>
+  <text x="680" y="380" class="title">TTS (stream)</text>
+  <text x="680" y="405" class="text">PCM audio</text>
+
+  <rect x="40" y="350" width="250" height="110" class="box"/>
+  <text x="60" y="380" class="title">Web Client</text>
+  <text x="60" y="405" class="text">audio playback + UI</text>
+
+  <path d="M290 80 L350 80" class="arrow"/>
+  <text x="300" y="70" class="label">JSON / PCM</text>
+
+  <path d="M600 80 L660 80" class="arrow"/>
+  <text x="615" y="70" class="label">dispatch</text>
+
+  <path d="M910 80 L920 80" class="arrow"/>
+  <text x="880" y="70" class="label">turn mgmt</text>
+
+  <path d="M750 160 L750 200" class="arrow"/>
+  <text x="705" y="190" class="label">audio chunks</text>
+
+  <path d="M840 250 L860 250" class="arrow"/>
+  <text x="835" y="240" class="label">vad status</text>
+
+  <path d="M1040 250 L1060 250" class="arrow"/>
+  <text x="1010" y="240" class="label">audio buffer</text>
+
+  <path d="M950 300 L950 350" class="arrow2"/>
+  <text x="930" y="340" class="label">EOU -> LLM</text>
+
+  <path d="M880 405 L920 405" class="arrow2"/>
+  <text x="870" y="395" class="label">text stream</text>
+
+  <path d="M660 405 L290 405" class="arrow2"/>
+  <text x="430" y="395" class="label">PCM audio</text>
+
+  <path d="M660 450 L350 450" class="arrow"/>
+  <text x="420" y="440" class="label">events: trackStart/End</text>
+
+  <path d="M350 450 L290 450" class="arrow"/>
+  <text x="315" y="440" class="label">UI updates</text>
+
+  <path d="M750 200 L750 160" class="arrow3"/>
+  <text x="700" y="145" class="label">barge-in detection</text>
+
+  <path d="M760 170 L920 170" class="arrow3"/>
+  <text x="820" y="160" class="label">interrupt event + cancel</text>
+</svg>