refactor(api): complete fastapi migration and related features

Finish native FastAPI controllers, drop vendored microdot, and add
Wi-Fi driver runtime, beat SSE, simulated BPM, sequence playback
improvements, bridge ESP-NOW sources, UI updates, and tests.

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

Pipfile

@@ -13,8 +13,8 @@ watchfiles = "*"
 requests = "*"
 selenium = "*"
 adafruit-ampy = "*"
-microdot = "*"
 fastapi = "*"
+python-multipart = "*"
 websockets = "*"
 httpx = "*"
 numpy = "*"