feat(backend): services PlantNet et YOLO pour identification de plantes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/services/plantnet.py

@@ -0,0 +1,35 @@
+import os
+from typing import List
+
+import httpx
+
+PLANTNET_KEY = os.environ.get("PLANTNET_API_KEY", "2b1088cHCJ4c7Cn2Vqq67xfve")
+PLANTNET_URL = "https://my-api.plantnet.org/v2/identify/all"
+
+
+async def identify(image_bytes: bytes, filename: str = "photo.jpg") -> List[dict]:
+    """Appelle PlantNet et retourne les 3 meilleures identifications."""
+    try:
+        async with httpx.AsyncClient(timeout=10.0) as client:
+            resp = await client.post(
+                PLANTNET_URL,
+                params={"api-key": PLANTNET_KEY, "nb-results": 3},
+                files={"images": (filename, image_bytes, "image/jpeg")},
+                data={"organs": ["auto"]},
+            )
+            resp.raise_for_status()
+            data = resp.json()
+    except Exception:
+        return []
+
+    results = []
+    for r in data.get("results", [])[:3]:
+        species = r.get("species", {})
+        common_names = species.get("commonNames", [])
+        results.append({
+            "species": species.get("scientificNameWithoutAuthor", ""),
+            "common_name": common_names[0] if common_names else "",
+            "confidence": round(r.get("score", 0.0), 3),
+            "image_url": (r.get("images", [{}]) or [{}])[0].get("url", {}).get("m", ""),
+        })
+    return results