fix: switch from MyMemory to Google Translate (no rate limit)

app/metadata_enrichment.py

@@ -278,16 +278,22 @@ class MetadataEnricher:
         return metadata
 
     async def _translate_to_french(self, text: str) -> str:
-        """Translate text to French using MyMemory API (free, no key needed)."""
+        """Translate text to French using Google Translate (free, no key)."""
         try:
             async with httpx.AsyncClient(timeout=15.0) as client:
                 response = await client.get(
-                    "https://api.mymemory.translated.net/get",
-                    params={"q": text[:490], "langpair": "en|fr"},
+                    "https://translate.googleapis.com/translate_a/single",
+                    params={
+                        "client": "gtx",
+                        "sl": "en",
+                        "tl": "fr",
+                        "dt": "t",
+                        "q": text[:4900],
+                    },
                 )
                 data = response.json()
-                translated = data.get("responseData", {}).get("translatedText", "")
-                if translated and translated.lower() != text[: len(translated)].lower():
+                translated = "".join(seg[0] for seg in data[0] if seg[0])
+                if translated:
                     return translated
         except Exception as e:
             logger.debug(f"Translation failed, using original: {e}")