chore: initialize insar management system v2

backend/app/routers/aoi.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from typing import Optional
+
+from fastapi import APIRouter
+
+from ..config import settings
+from . import dependencies as deps
+
+router = APIRouter()
+
+
+@router.get("/aoi/regions/children")
+async def list_aoi_region_children(parent_tree_id: Optional[str] = "1"):
+    deps._load_region_index()
+    parent = (parent_tree_id or "1").strip() or "1"
+    children = (deps._REGION_CHILDREN_CACHE or {}).get(parent, [])
+    return {
+        "parent_tree_id": parent,
+        "children": children,
+    }
+
+
+@router.get("/aoi/regions/{tree_id}/geometry")
+async def get_aoi_region_geometry(tree_id: str):
+    return deps._resolve_region_aoi_payload(tree_id)