Separate config models from loader

- configs/models.py: AppConfig and all section dataclasses
- configs/load.py: pure loading logic (yaml, env overrides)
- config = load_config() singleton for consumers

configs/models.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+
+
+@dataclass
+class ServerConfig:
+    host: str = "0.0.0.0"
+    port: int = 8765
+    max_ws_size: int = 10_485_760
+
+
+@dataclass
+class VideoConfig:
+    process_every_n_frames: int = 1
+
+
+@dataclass
+class ModelConfig:
+    path: str = ""
+    prefer_gpu: bool = True
+
+    @property
+    def resolved_path(self) -> str:
+        if self.path:
+            return self.path
+        return str(Path(__file__).resolve().parent.parent / "pose_models" / "pose_landmarker_full.task")
+
+
+@dataclass
+class DeadBugConfig:
+    visibility_threshold: float = 0.45
+    extension_confirm_frames: int = 4
+    reset_confirm_frames: int = 3
+
+
+@dataclass
+class AudioConfig:
+    rep_announcer_enabled: bool = True
+    rep_announcer_rate: int = 185
+    rep_announcer_volume: float = 1.0
+
+
+@dataclass
+class LoggingConfig:
+    dir: str = "logs"
+    rotation: str = "20 MB"
+    retention: str = "14 days"
+
+    @property
+    def dir_path(self) -> Path:
+        return Path(__file__).resolve().parent.parent / self.dir
+
+
+@dataclass
+class AppConfig:
+    server: ServerConfig = field(default_factory=ServerConfig)
+    video: VideoConfig = field(default_factory=VideoConfig)
+    model: ModelConfig = field(default_factory=ModelConfig)
+    dead_bug: DeadBugConfig = field(default_factory=DeadBugConfig)
+    audio: AudioConfig = field(default_factory=AudioConfig)
+    logging: LoggingConfig = field(default_factory=LoggingConfig)