feat: add ML service response schemas

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/ml-service/schemas.py

@@ -0,0 +1,21 @@
+from pydantic import BaseModel
+
+
+class HealthResponse(BaseModel):
+    status: str
+    model_loaded: bool
+
+
+class MetadataResponse(BaseModel):
+    service_name: str
+    service_version: str
+    model_path: str
+    model_loaded: bool
+    input_size: int
+    labels: list[str]
+
+
+class PredictionResponse(BaseModel):
+    label: str
+    confidence: float
+    probabilities: dict[str, float]