feat: initial commit — VoiceCoach real-time voice coaching pipeline

Services: Pipecat agent (LiveKit + Claude + Whisper STT + Piper TTS),
SpeechBrain analysis service, Piper TTS service, web client (nginx).
Includes LiveKit server config and docker-compose orchestration.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web-client/style.css

@@ -0,0 +1,88 @@
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+body {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+  background: #1a1a2e;
+  color: #eee;
+  min-height: 100vh;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+}
+
+.container {
+  max-width: 420px;
+  width: 100%;
+  padding: 24px;
+}
+
+.header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 24px;
+}
+
+h1 { font-size: 24px; font-weight: 600; }
+
+.status {
+  padding: 4px 12px;
+  border-radius: 12px;
+  font-size: 12px;
+  font-weight: 600;
+  text-transform: uppercase;
+}
+.status.disconnected { background: #444; color: #aaa; }
+.status.connecting { background: #553; color: #ffa; }
+.status.connected { background: #253; color: #5f5; }
+
+.controls { margin-bottom: 20px; }
+
+.btn {
+  width: 100%;
+  padding: 14px;
+  border: none;
+  border-radius: 8px;
+  font-size: 16px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: opacity 0.2s;
+}
+.btn:hover { opacity: 0.85; }
+.btn-primary { background: #4a6cf7; color: #fff; }
+.btn-danger { background: #f74a4a; color: #fff; }
+
+.mode-display {
+  text-align: center;
+  font-size: 13px;
+  color: #888;
+  margin-bottom: 16px;
+}
+
+.transcript {
+  background: #16213e;
+  border-radius: 8px;
+  padding: 16px;
+  min-height: 200px;
+  max-height: 400px;
+  overflow-y: auto;
+  margin-bottom: 16px;
+}
+.transcript .hint { color: #666; font-style: italic; }
+
+.mode-buttons {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 8px;
+}
+.mode-btn {
+  padding: 10px;
+  background: #16213e;
+  border: 1px solid #333;
+  border-radius: 6px;
+  color: #ccc;
+  font-size: 13px;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+.mode-btn:hover { background: #1a2744; border-color: #4a6cf7; }