Parse config.yaml into typed AppConfig dataclass

- ServerConfig, VideoConfig, ModelConfig, DeadBugConfig,
  AudioConfig, LoggingConfig as nested dataclasses
- Consumers use config.server.host, config.model.resolved_path etc.
- env var overrides preserved via _apply_env_overrides()

app/webrtc/video_receiver.py

@@ -10,17 +10,7 @@ from loguru import logger
 from app.audio.rep_announcer import RepAnnouncer
 from app.exercises.dead_bug.detector import DeadBugDetector
 from app.rendering.window_display import close_window, is_esc_pressed, show_frame
-from configs.load import (
-    EXTENSION_CONFIRM_FRAMES,
-    MODEL_PATH,
-    PREFER_GPU,
-    PROCESS_EVERY_N_FRAMES,
-    REP_ANNOUNCER_ENABLED,
-    REP_ANNOUNCER_RATE,
-    REP_ANNOUNCER_VOLUME,
-    RESET_CONFIRM_FRAMES,
-    VISIBILITY_THRESHOLD,
-)
+from configs.load import config
 
 
 def _format_pose_debug(pose_result) -> str:
@@ -41,21 +31,21 @@ class VideoReceiver:
         self._track = track
 
     async def run(self) -> None:
-        logger.info("Start receiving video frames, process_every_n={}", PROCESS_EVERY_N_FRAMES)
+        logger.info("Start receiving video frames, process_every_n={}", config.video.process_every_n_frames)
 
         frame_count = 0
         processed_count = 0
         detector = DeadBugDetector(
-            model_path=MODEL_PATH,
-            visibility_threshold=VISIBILITY_THRESHOLD,
-            extension_confirm_frames=EXTENSION_CONFIRM_FRAMES,
-            reset_confirm_frames=RESET_CONFIRM_FRAMES,
-            prefer_gpu=PREFER_GPU,
+            model_path=config.model.resolved_path,
+            visibility_threshold=config.dead_bug.visibility_threshold,
+            extension_confirm_frames=config.dead_bug.extension_confirm_frames,
+            reset_confirm_frames=config.dead_bug.reset_confirm_frames,
+            prefer_gpu=config.model.prefer_gpu,
         )
         announcer = RepAnnouncer(
-            enabled=REP_ANNOUNCER_ENABLED,
-            rate=REP_ANNOUNCER_RATE,
-            volume=REP_ANNOUNCER_VOLUME,
+            enabled=config.audio.rep_announcer_enabled,
+            rate=config.audio.rep_announcer_rate,
+            volume=config.audio.rep_announcer_volume,
         )
         last_announced_rep = 0
         last_pose_result = None
@@ -68,7 +58,7 @@ class VideoReceiver:
                 raw_img = frame.to_ndarray(format="bgr24")
                 timestamp_ms = int(frame.time * 1000) if frame.time is not None else frame_count * 33
 
-                if frame_count % PROCESS_EVERY_N_FRAMES == 0 or last_pose_result is None:
+                if frame_count % config.video.process_every_n_frames == 0 or last_pose_result is None:
                     processed_count += 1
                     last_annotated, last_pose_result = detector.process_frame(raw_img, timestamp_ms)
                     if last_pose_result.rep_count > last_announced_rep: