map settings api endpoint (fixes #201)

src/c3nav/mapdata/schemas/responses.py

@@ -1,12 +1,36 @@
-from typing import Annotated, Union
+from typing import Annotated, Union, Optional
 
 from pydantic import Field as APIField
 from pydantic import PositiveInt
 
 from c3nav.api.schema import BaseSchema, GeometrySchema
+from c3nav.mapdata.grid import GridSchema
 from c3nav.mapdata.schemas.model_base import AnyLocationID, BoundsSchema
 
 
+class MapSettingsSchema(BaseSchema):
+    """
+    various c3nav instance settings
+    """
+    initial_bounds: Optional[BoundsSchema] = APIField(
+        title="initial boundaries",
+        description="(left, bottom) to (top, right)",
+    )
+    initial_level: Optional[PositiveInt] = APIField(
+        title="initial level id",
+        description="the level id that is intially shown when opening the map",
+    )
+
+    grid: Optional[GridSchema] = APIField(
+        title="grid config",
+        description="grid configuration, if available",
+    )
+    tile_server: Optional[str] = APIField(
+        title="tile server base URL",
+        description="tile server base URL to use, if configured",
+    )
+
+
 class WithBoundsSchema(BaseSchema):
     """
     Describing a bounding box