fix: Improve French e-commerce sites configuration

- Change default currency from USD to EUR for all French sites
- Update AI extraction prompt to use EUR by default
- Fix E.Leclerc search URL pattern
- Improve product selectors for Auchan, Carrefour, Amazon France
- Add Amazon France language parameter for better results
- Enhance cookie acceptance with site-specific selectors:
  - Amazon (#sp-cc-accept)
  - E.Leclerc (#onetrust-accept-btn-handler)
  - Auchan (#popin_tc_privacy_button_2, #didomi-notice-agree-button)
  - Carrefour (#onetrust-accept-btn-handler)
  - Cdiscount (#footer_tc_privacy_button_2)
  - And more CMP platforms (Didomi, OneTrust, Tarteaucitron, etc.)
- Improve cookie handling with iframe support and retry logic

app/ai_schema.py

@@ -38,7 +38,7 @@ class AIExtractionResponse(BaseModel):
         description="Extracted price as a number, or null if no price found",
     )
     currency: str = Field(
-        "USD",
+        "EUR",
         description="Currency code (ISO 4217)",
     )
     in_stock: bool | None = Field(
@@ -137,7 +137,7 @@ EXTRACTION_PROMPT_TEMPLATE = """Extract product price and stock status from the
 Respond ONLY with valid JSON:
 {{
   "price": <number or null>,
-  "currency": "USD",
+  "currency": "EUR",
   "in_stock": <true, false, or null>,
   "price_confidence": <0.0 to 1.0>,
   "in_stock_confidence": <0.0 to 1.0>,