Add alphabet navigation to scraper - now collects ALL 233 countries

- Implemented alphabet navigation (A-Z) for NJC international rates page
- Added request delays (2s) and retry logic with exponential backoff to avoid server timeouts
- Added error handling for pages without tables
- Installed html5lib for better HTML parsing
- Now scrapes 233 countries (up from 15) with 104 unique currencies
- Total 11,628 international rate entries collected
- Added verification scripts to check all countries and their currencies
- Fixed currency extraction working perfectly for EUR, USD, CAD, AUD, ARS, and 99+ other currencies

scripts/check_njc_page.py

@@ -0,0 +1,35 @@
+"""Check what's on the NJC international page"""
+import sys
+sys.path.insert(0, 'src')
+
+from gov_travel.scrapers import fetch_html
+from bs4 import BeautifulSoup
+
+url = "https://www.njc-cnm.gc.ca/directive/app_d.php?lang=en"
+print(f"Fetching: {url}\n")
+
+html = fetch_html(url)
+soup = BeautifulSoup(html, 'html.parser')
+
+# Count tables
+tables = soup.find_all('table')
+print(f"Total tables found: {len(tables)}")
+
+# Find all headings before tables (country names)
+countries = set()
+for table in tables:
+    heading = table.find_previous(['h1', 'h2', 'h3', 'h4'])
+    if heading:
+        text = heading.get_text(strip=True)
+        # Extract country name (before " - Currency:")
+        if ' - Currency:' in text:
+            country = text.split(' - Currency:')[0].strip()
+            countries.add(country)
+
+print(f"\nUnique countries found: {len(countries)}")
+print("\nFirst 20 countries:")
+for i, country in enumerate(sorted(countries)[:20], 1):
+    print(f"{i:2}. {country}")
+
+if len(countries) > 20:
+    print(f"\n... and {len(countries) - 20} more")