❤️ (VCS/VTC+VCC) Lack of "Survival Mode"

### ⚠️ Issue:

The robot currently sends the same data regardless of whether the server is listening.

### 🎯 Location:

/robot/vital_pulse_generator
/server/vital_pulse_analyzer

### 🦠 Symptoms:
 
- Wasting battery and network bandwidth when "offline."

### 🩺 Diagnosis:

- Implement a Dynamic Heartbeat (60 OPM when offline, 3,000 OPM when feedback is detected).
- Can be fixed together with #9.
