feat: Implement stock listing extraction and database population

- Added `extract_listings.py` for extracting stock listings from TSX, TSXV, CSE, and CBOE using Playwright.
- Created `main.py` to orchestrate the entire stock intelligence system, including extraction, database import, financial scraping, news scraping, and report generation.
- Developed `populate_database.py` to populate the database with existing JSON data.
- Introduced `scrape_nasdaq_tsx_only.py` for focused scraping of NASDAQ and TSX stocks.
- Added `setup.py` for initial setup and testing of the system.
- Created `watchlist.txt` template for user-defined stock tracking.
- Generated `final_test_output.txt` to log the results of the test run.

watchlist.txt

@@ -0,0 +1,14 @@
+# Watchlist Template
+# Add stock tickers you want to track (one per line)
+# Lines starting with # are comments and will be ignored
+
+# Example US Stocks
+AAPL
+MSFT
+TSLA
+
+# Example Canadian Stocks  
+SHOP
+CVV
+
+# Add your stocks below: