refactor: 移除硬编码动作，动画完全由JSON配置驱动

fix: 调整思考动画，减少向后仰头幅度

improve: 改进说话动画，使用多频率振荡器模拟自然头部摆动

improve: 增强说话动画幅度，更自然地模拟人类讲话

Speaking: pause face tracking, use lively nodding animation (1.5Hz)

Fix: Eliminate race condition in pipeline state, adjust animation amplitudes to moderate level

Increase control loop to 100Hz (daemon updated), adjust animation frequencies

Adjust animation parameters: idle=no movement, larger amplitudes, slower frequencies for smoother motion

v0.5.13: JSON-driven animation system + new landing page style