Add vector change detection foundation

backend/app/schemas/analysis.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from datetime import datetime
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+
+class ChangeDetectionRequest(BaseModel):
+    source_dataset_id: UUID
+    target_dataset_id: UUID
+    iou_threshold: float = Field(default=0.8, ge=0.0, le=1.0)
+    include_unchanged: bool = True
+
+
+class ChangeDetectionSummary(BaseModel):
+    source_dataset_id: UUID
+    target_dataset_id: UUID
+    source_feature_count: int
+    target_feature_count: int
+    added_count: int
+    removed_count: int
+    unchanged_count: int
+    iou_threshold: float
+    warnings: list[str] = Field(default_factory=list)
+    generated_at: datetime
+    geojson: dict