add dev setup/run scripts and Resend test email docs

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

padelnomics/scripts/dev_run.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Start all Padelnomics dev processes with colored, labeled output.
+#
+# Usage: ./scripts/dev_run.sh
+#
+# Starts: app (port 5000), background worker, CSS watcher.
+# Ctrl-C stops everything cleanly.
+
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+
+# -- Colors for each process -------------------------------------------------
+
+COLOR_APP='\033[0;36m'     # cyan
+COLOR_WORKER='\033[0;33m'  # yellow
+COLOR_CSS='\033[0;35m'     # magenta
+NC='\033[0m'
+BOLD='\033[1m'
+
+PIDS=()
+
+cleanup() {
+    echo ""
+    echo -e "${BOLD}Stopping all processes...${NC}"
+    for pid in "${PIDS[@]}"; do
+        kill "$pid" 2>/dev/null || true
+    done
+    wait 2>/dev/null || true
+    echo "Done."
+    exit 0
+}
+
+trap cleanup SIGINT SIGTERM
+
+# Prefix each line of a command's output with a colored label.
+# Usage: run_with_label COLOR LABEL COMMAND...
+run_with_label() {
+    local color="$1" label="$2"
+    shift 2
+    "$@" 2>&1 | while IFS= read -r line; do
+        echo -e "${color}[${label}]${NC} ${line}"
+    done &
+    PIDS+=($!)
+}
+
+# -- Start processes ---------------------------------------------------------
+
+echo -e "${BOLD}Starting Padelnomics dev environment${NC}"
+echo ""
+echo "  app:    http://localhost:5000"
+echo "  admin:  http://localhost:5000/admin"
+echo "  login:  http://localhost:5000/auth/dev-login?email=dev@localhost"
+echo ""
+echo "Press Ctrl-C to stop all processes."
+echo ""
+
+run_with_label "$COLOR_APP"    "app   " uv run python -m padelnomics.app
+run_with_label "$COLOR_WORKER" "worker" uv run python -m padelnomics.worker
+run_with_label "$COLOR_CSS"    "css   " make css-watch
+
+wait