refactor: Organize and implement player and playlist schemas

app/schemas/player.py

@@ -0,0 +1,23 @@
+"""Player schemas."""
+
+from pydantic import BaseModel, Field
+
+from app.services.player import PlayerMode
+
+
+class PlayerSeekRequest(BaseModel):
+    """Request model for seek operation."""
+
+    position_ms: int = Field(ge=0, description="Position in milliseconds")
+
+
+class PlayerVolumeRequest(BaseModel):
+    """Request model for volume control."""
+
+    volume: int = Field(ge=0, le=100, description="Volume level (0-100)")
+
+
+class PlayerModeRequest(BaseModel):
+    """Request model for mode change."""
+
+    mode: PlayerMode = Field(description="Playback mode")