Initial scaffold: React+TS+Vite frontend, FastAPI backend, config system

backend/config.py

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+import yaml
+from pathlib import Path
+from pydantic import BaseModel
+
+CONFIG_PATH = Path(__file__).parent.parent / "config.yaml"
+
+
+class Go2RTCConfig(BaseModel):
+    url: str = "http://localhost:1985"
+
+
+class FrigateConfig(BaseModel):
+    url: str = "http://localhost:5000"
+
+
+class MQTTConfig(BaseModel):
+    host: str = "localhost"
+    port: int = 1883
+    topic_prefix: str = "frigate"
+    username: str = ""
+    password: str = ""
+
+
+class CameraConfig(BaseModel):
+    name: str
+    display_name: str = ""
+    enabled: bool = True
+    order: int = 0
+
+
+class AlertConfig(BaseModel):
+    enabled: bool = False
+    auto_dismiss_seconds: int = 30
+    suppression_seconds: int = 60
+    cameras: list[str] = []
+    detection_types: list[str] = ["person"]
+
+
+class GridConfig(BaseModel):
+    columns: int | None = None
+    aspect_ratio: str = "16:9"
+    gap: int = 4
+
+
+class AppConfig(BaseModel):
+    title: str = "Camera Viewer"
+    go2rtc: Go2RTCConfig = Go2RTCConfig()
+    frigate: FrigateConfig = FrigateConfig()
+    mqtt: MQTTConfig = MQTTConfig()
+    cameras: list[CameraConfig] = []
+    alerts: AlertConfig = AlertConfig()
+    grid: GridConfig = GridConfig()
+
+
+_config: AppConfig | None = None
+
+
+def load_config() -> AppConfig:
+    global _config
+    if not CONFIG_PATH.exists():
+        _config = AppConfig()
+        return _config
+
+    with open(CONFIG_PATH) as f:
+        data = yaml.safe_load(f) or {}
+
+    _config = AppConfig(**data)
+    return _config
+
+
+def save_config(config: AppConfig) -> None:
+    global _config
+    _config = config
+    data = config.model_dump()
+    with open(CONFIG_PATH, "w") as f:
+        yaml.dump(data, f, default_flow_style=False, sort_keys=False)
+
+
+def get_config() -> AppConfig:
+    global _config
+    if _config is None:
+        return load_config()
+    return _config