Ship the portal FastAPI controller with presets, sequences, and live audio.

Move the app under src/, add ring-spanning patterns with shared fonts and
beat-driven motion, and wire global audio settings into the web UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/patterns/plasma.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python3
+"""Plasma field."""
+
+from __future__ import annotations
+
+import math
+
+from leds.colors import hsv_to_rgb
+from leds.pattern import Pattern, run_cli, set_pixel, size
+
+
+class Plasma(Pattern):
+    id = "plasma"
+    label = "Plasma"
+    fps = 25
+
+    def draw(self, surface, t, params):
+        w, h = size(surface)
+        phase = t * self.fps * 0.08
+        for y in range(h):
+            for x in range(w):
+                v = (
+                    math.sin(x * 0.15 + phase)
+                    + math.sin(y * 0.2 - phase * 1.3)
+                    + math.sin((x + y) * 0.1 + phase * 0.7)
+                ) / 3.0
+                set_pixel(surface, x, y, hsv_to_rgb((v + 1) / 2, 1.0, 1.0))
+
+
+if __name__ == "__main__":
+    run_cli(Plasma)