Refactor patterns to use preset-based API and fix initialization order

- Fix initialization order: initialize self.presets before calling self.select()
- Separate add() and edit() methods: add() creates new presets, edit() updates existing ones
- Update all test files to use add() instead of edit() for creating presets
- Add comprehensive auto/manual mode test
- Remove tool.py (moved to led-tool project)

test/patterns/off.py

@@ -12,7 +12,10 @@ def main():
 
     p = Patterns(pin=pin, num_leds=num)
     wdt = WDT(timeout=10000)
-    p.select("off")
+    
+    # Create an "off" preset
+    p.add("test_off", {"pattern": "off"})
+    p.select("test_off")
 
     start = utime.ticks_ms()
     while utime.ticks_diff(utime.ticks_ms(), start) < 200: