feat: improve SPA scraping and increase test coverage

- Add SPA support for Playwright with wait_for_network_idle and extra_wait_ms
- Add BaseStore.get_spa_config() and requires_playwright() methods
- Implement AliExpress SPA config with JSON price extraction patterns
- Fix Amazon price parsing to prioritize whole+fraction combination
- Fix AliExpress regex patterns (remove double backslashes)
- Add CLI tests: detect, doctor, fetch, parse, run commands
- Add API tests: auth, logs, products, scraping_logs, webhooks

Tests: 417 passed, 85% coverage

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pricewatch/app/stores/amazon/store.py

@@ -215,6 +215,19 @@ class AmazonStore(BaseStore):
 
     def _extract_price(self, soup: BeautifulSoup, debug: DebugInfo) -> Optional[float]:
         """Extrait le prix."""
+        # Priorité 1: combiner les spans séparés a-price-whole et a-price-fraction
+        # C'est le format le plus courant sur Amazon pour les prix avec centimes séparés
+        whole = soup.select_one("span.a-price-whole")
+        fraction = soup.select_one("span.a-price-fraction")
+        if whole and fraction:
+            whole_text = whole.get_text(strip=True).rstrip(",.")
+            fraction_text = fraction.get_text(strip=True)
+            if whole_text and fraction_text:
+                price = parse_price_text(f"{whole_text}.{fraction_text}")
+                if price is not None:
+                    return price
+
+        # Priorité 2: essayer les sélecteurs (incluant a-price-whole seul avec prix complet)
         selectors = self.get_selector("price", [])
         if isinstance(selectors, str):
             selectors = [selectors]
@@ -227,16 +240,6 @@ class AmazonStore(BaseStore):
                 if price is not None:
                     return price
 
-        # Fallback: chercher les spans séparés a-price-whole et a-price-fraction
-        whole = soup.select_one("span.a-price-whole")
-        fraction = soup.select_one("span.a-price-fraction")
-        if whole and fraction:
-            whole_text = whole.get_text(strip=True)
-            fraction_text = fraction.get_text(strip=True)
-            price = parse_price_text(f"{whole_text}.{fraction_text}")
-            if price is not None:
-                return price
-
         debug.errors.append("Prix non trouvé")
         return None