initial structure implemented

docs -> _docs

api/dependencies.py

@@ -0,0 +1,20 @@
+from components.flight_api import FlightAPI, FlightAPIBase
+from components.sse_event_streamer import SSEEventStreamer, SSEEventStreamerBase
+
+_flight_api: FlightAPIBase | None = None
+_sse_streamer: SSEEventStreamerBase | None = None
+
+
+def get_flight_api() -> FlightAPIBase:
+    global _flight_api
+    if _flight_api is None:
+        _flight_api = FlightAPI()
+    return _flight_api
+
+
+def get_sse_streamer() -> SSEEventStreamerBase:
+    global _sse_streamer
+    if _sse_streamer is None:
+        _sse_streamer = SSEEventStreamer()
+    return _sse_streamer
+