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>

tests/test_bridge_envelope.py

@@ -43,18 +43,32 @@ def test_deliver_json_messages_defaults_broadcast():
         def __init__(self):
             self.keys = []
 
-        async def send(self, envelope):
+        async def send(self, envelope, addr=None):
+            del addr
             devs = envelope.get("dv") or envelope.get("devices") or {}
             self.keys.extend(devs.keys())
             return True
 
+    class _Devices:
+        def read(self, mac):
+            return {
+                "id": mac,
+                "name": mac,
+                "transport": "espnow",
+                "address": mac,
+            }
+
+        def items(self):
+            return []
+
     async def _run():
         bridge = _Bridge()
         await deliver_json_messages(
             bridge,
             [json.dumps({"v": "1", "select": ["2"]})],
-            ["188b0e1560a8", "e8f60a16ea10"],
             None,
+            _Devices(),
+            delay_s=0,
         )
         return bridge.keys