feat: Fan curve profiles and presets

[cursor]

Feature Description

Pre-configured fan curve profiles for different use cases.

Proposed Profiles

1. Silent Mode

• Prioritize quietness
• Fans run slower
• Accept higher temps
• Smooth curves

2. Balanced Mode

• Optimal noise/performance
• Standard curves
• Default recommendation

3. Performance Mode

• Maximum cooling
• Aggressive curves
• Fans ramp up quickly
• Noise not a concern

4. Custom Profiles

• User-created curves
• Save up to 5 custom profiles
• Name and description
• Share profiles (export/import JSON)

Implementation

Storage

• Store profiles in flash
• Active profile selection
• Profile switching via USB

CLI

pico-fan-ctl profile list
pico-fan-ctl profile set silent
pico-fan-ctl profile set performance
pico-fan-ctl profile create my-gaming
pico-fan-ctl profile export my-gaming > profile.json
pico-fan-ctl profile import < profile.json

Profile Format

{
  "name": "Silent",
  "curves": [
    {"temp": 20, "pwm": 30},
    {"temp": 40, "pwm": 50},
    {"temp": 60, "pwm": 80}
  ],
  "rgb": "breathing_blue"
}

Priority

Medium - Great UX improvement