fix(extract,transform): fix COT/prices column name mismatches + OWM rate limit skip

- fct_cot_positioning: quote Swap__Positions_Short_All and Swap__Positions_Spread_All
  (CSV uses double underscore; DuckDB preserves header names exactly)
- fct_cot_positioning: quote Report_Date_as_YYYY-MM-DD (dashes preserved in header)
- fct_coffee_prices: quote "Adj Close" (space in CSV header)
- openmeteo/execute.py: skip API call in backfill when all daily files already exist
  (_count_existing_files pre-check prevents 429 rate limit on re-runs)
- dev_run.sh: open browser as admin@beanflows.coffee instead of pro@

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/scripts/dev_run.sh

@@ -168,7 +168,7 @@ run_with_label "$COLOR_CSS"    "css   " make css-watch
 # Open a private/incognito browser window once the server is ready.
 # Polls /auth/dev-login until it responds (up to 10 seconds), then launches.
 (
-    DEV_URL="http://localhost:5001/auth/dev-login?email=pro@beanflows.coffee"
+    DEV_URL="http://localhost:5001/auth/dev-login?email=admin@beanflows.coffee"
     for i in $(seq 1 20); do
         sleep 0.5
         if curl -s -o /dev/null -w "%{http_code}" "$DEV_URL" 2>/dev/null | grep -qE "^[23]"; then