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.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "b6783f8de9b1f98387fccab1d9fed190f2acbf66f0f188e43fe91f28a6950ad1"
+            "sha256": "898e7932e8decb3f1b5e1fd620883f2727cbd2f1c1295d8cd559105172d814cb"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -597,15 +597,6 @@
             "markers": "python_version >= '3.7'",
             "version": "==0.1.2"
         },
-        "microdot": {
-            "hashes": [
-                "sha256:206c52870e3b1d5e6d387802e2ed0afae8c4598c80542a21e3efe377efc128c8",
-                "sha256:7bb9a69fa97a47d8fe07e61d9dd405804744132ca52d26705cf1173431ff7f4b"
-            ],
-            "index": "pypi",
-            "markers": "python_version >= '3.8'",
-            "version": "==2.6.2"
-        },
         "mpremote": {
             "hashes": [
                 "sha256:2df2a50f3c8098cae8c732dbf2541e7e58185e7896513b45d05196901e049334",
@@ -901,6 +892,15 @@
             "markers": "python_version >= '3.10'",
             "version": "==1.2.2"
         },
+        "python-multipart": {
+            "hashes": [
+                "sha256:be54b7f3fa167bb83e4fcd936b887b708f4e57fe75911c02aebf53efaf8d938e",
+                "sha256:ff6d3f776f16878c894e52e107296ffc890e913c611b1a4ec6c44e2821fe2e23"
+            ],
+            "index": "pypi",
+            "markers": "python_version >= '3.10'",
+            "version": "==0.0.32"
+        },
         "pyyaml": {
             "hashes": [
                 "sha256:00c4bdeba853cc34e7dd471f16b4114f4162dc03e6b7afcc2128711f0eca823c",