feat(devices): BLE LED controller support (SP110E/Triones/Zengge/Govee)

End-to-end BLE streaming: provider + client + per-protocol wire encoders
with whole-strip averaging, desktop (bleak) and Android (Kotlin BleBridge
via Chaquopy) transports, discovery with protocol-family detection that
auto-fills the UI, throttled not-connected warning + 10 s reconnect
cooldown so a dropped link no longer stalls the pipeline at ~30 s/frame,
and an explicit asyncio.wait_for wrapper around bleak connect() since
the WinRT backend doesn't always honor the timeout kwarg.

Also rewrites server/restart.ps1 to be parameterized (-Port / -Module /
-PythonVersion / timeouts / -Quiet), pick the right interpreter via the
py launcher, pre-flight the target module, poll port readiness on both
shutdown and startup, redirect child stdout/stderr so Start-Process
doesn't hang on inherited Git-Bash handles, and return proper exit codes.

Rolls in concurrent work: Android BLE permissions + launcher icons + ru/zh
resources, Chaquopy-safe value_stream psutil fallback, setup-required
modal, asset-store test coverage, and misc system/config touch-ups.

server/config/default_config.yaml

@@ -18,8 +18,12 @@ auth:
   api_keys: {}
   #  dev: "replace-with-openssl-rand-hex-32"
 
-storage:
-  database_file: "data/ledgrab.db"
+# Storage paths default to ./data relative to the server's working directory.
+# Set LEDGRAB_DATA_DIR in the environment to point at a different data root
+# (the whole dir — both the database and assets), or uncomment the block
+# below to pin an absolute database file.
+# storage:
+#   database_file: "/absolute/path/to/ledgrab.db"
 
 mqtt:
   enabled: false